connections { # } Section defining IKE connection configurations. Section defining IKE connection configurations. The connections section defines IKE connection configurations, each in its own subsections. In the keyword description below, the connection is named __, but an arbitrary yet unique connection name can be chosen for each connection subsection. connections. { # } Section for an IKE connection named . connections..version = 0 IKE major version to use for connection. IKE major version to use for connection. _1_ uses IKEv1 aka ISAKMP, _2_ uses IKEv2. A connection using the default of _0_ accepts both IKEv1 and IKEv2 as responder, and initiates the connection actively with IKEv2. connections..local_addrs = %any Local address(es) to use for IKE communication, comma separated. Local address(es) to use for IKE communication, comma separated. Takes single IPv4/IPv6 addresses, DNS names, CIDR subnets or IP address ranges. As initiator, the first non-range/non-subnet is used to initiate the connection from. As responder, the local destination address must match at least to one of the specified addresses, subnets or ranges. connections..remote_addrs = %any Remote address(es) to use for IKE communication, comma separated. Remote address(es) to use for IKE communication, comma separated. Takes single IPv4/IPv6 addresses, DNS names, CIDR subnets or IP address ranges. As initiator, the first non-range/non-subnet is used to initiate the connection to. As responder, the initiator source address must match at least to one of the specified addresses, subnets or ranges. To initiate a connection, at least one specific address or DNS name must be specified. connections..local_port = 500 Local UDP port for IKE communication. Local UDP port for IKE communication. By default the port of the socket backend is used, which is usually _500_. If port _500_ is used, automatic IKE port floating to port 4500 is used to work around NAT issues. Using a non-default local IKE port requires support from the socket backend in use (socket-dynamic). connections..remote_port = 500 Remote UDP port for IKE communication. Remote UDP port for IKE communication. If the default of port _500_ is used, automatic IKE port floating to port 4500 is used to work around NAT issues. connections..proposals = default Comma separated proposals to accept for IKE. A proposal is a set of algorithms. For non-AEAD algorithms, this includes for IKE an encryption algorithm, an integrity algorithm, a pseudo random function and a Diffie-Hellman group. For AEAD algorithms, instead of encryption and integrity algorithms, a combined algorithm is used. In IKEv2, multiple algorithms of the same kind can be specified in a single proposal, from which one gets selected. In IKEv1, only one algorithm per kind is allowed per proposal, more algorithms get implicitly stripped. Use multiple proposals to offer different algorithms combinations in IKEv1. Algorithm keywords get separated using dashes. Multiple proposals may be separated by commas. The special value _default_ forms a default proposal of supported algorithms considered safe, and is usually a good choice for interoperability. connections..vips = Virtual IPs to request in configuration payload / Mode Config. Comma separated list of virtual IPs to request in IKEv2 configuration payloads or IKEv1 Mode Config. The wildcard addresses _0.0.0.0_ and _::_ request an arbitrary address, specific addresses may be defined. The responder may return a different address, though, or none at all. connections..aggressive = no Use Aggressive Mode in IKEv1. Enables Aggressive Mode instead of Main Mode with Identity Protection. Aggressive Mode is considered less secure, because the ID and HASH payloads are exchanged unprotected. This allows a passive attacker to snoop peer identities, and even worse, start dictionary attacks on the Preshared Key. connections..pull = yes Set the Mode Config mode to use. If the default of _yes_ is used, Mode Config works in pull mode, where the initiator actively requests a virtual IP. With _no_, push mode is used, where the responder pushes down a virtual IP to the initiating peer. Push mode is currently supported for IKEv1, but not in IKEv2. It is used by a few implementations only, pull mode is recommended. connections..encap = no Enforce UDP encapsulation by faking NAT-D payloads. To enforce UDP encapsulation of ESP packets, the IKE daemon can fake the NAT detection payloads. This makes the peer believe that NAT takes place on the path, forcing it to encapsulate ESP packets in UDP. Usually this is not required, but it can help to work around connectivity issues with too restrictive intermediary firewalls. connections..mobike = yes Enables MOBIKE on IKEv2 connections. Enables MOBIKE on IKEv2 connections. MOBIKE is enabled by default on IKEv2 connections, and allows mobility of clients and multi-homing on servers by migrating active IPsec tunnels. Usually keeping MOBIKE enabled is unproblematic, as it is not used if the peer does not indicate support for it. However, due to the design of MOBIKE, IKEv2 always floats to port 4500 starting from the second exchange. Some implementations don't like this behavior, hence it can be disabled. connections..dpd_delay = 0s Interval of liveness checks (DPD). Interval to check the liveness of a peer actively using IKEv2 INFORMATIONAL exchanges or IKEv1 R_U_THERE messages. Active DPD checking is only enforced if no IKE or ESP/AH packet has been received for the configured DPD delay. connections..dpd_timeout = 0s Timeout for DPD checks (IKEV1 only). Charon by default uses the normal retransmission mechanism and timeouts to check the liveness of a peer, as all messages are used for liveness checking. For compatibility reasons, with IKEv1 a custom interval may be specified; this option has no effect on connections using IKE2. connections..fragmentation = yes Use IKE UDP datagram fragmentation. (_yes_, _no_ or _force_). Use IKE fragmentation (proprietary IKEv1 extension or RFC 7383 IKEv2 fragmentation). Acceptable values are _yes_ (the default), _force_ and _no_. Fragmented IKE messages sent by a peer are always accepted irrespective of the value of this option. If set to _yes_, and the peer supports it, oversized IKE messages will be sent in fragments. If set to _force_ (only supported for IKEv1) the initial IKE message will already be fragmented if required. connections..send_certreq = yes Send certificate requests payloads (_yes_ or _no_). Send certificate request payloads to offer trusted root CA certificates to the peer. Certificate requests help the peer to choose an appropriate certificate/private key for authentication and are enabled by default. Disabling certificate requests can be useful if too many trusted root CA certificates are installed, as each certificate request increases the size of the initial IKE packets. connections..send_cert = ifasked Send certificate payloads (_always_, _never_ or _ifasked_). Send certificate payloads when using certificate authentication. With the default of _ifasked_ the daemon sends certificate payloads only if certificate requests have been received. _never_ disables sending of certificate payloads altogether, _always_ causes certificate payloads to be sent unconditionally whenever certificate authentication is used. connections..keyingtries = 1 Number of retransmission sequences to perform during initial connect. Number of retransmission sequences to perform during initial connect. Instead of giving up initiation after the first retransmission sequence with the default value of _1_, additional sequences may be started according to the configured value. A value of _0_ initiates a new sequence until the connection establishes or fails with a permanent error. connections..unique = no Connection uniqueness policy (_never_, _no_, _keep_ or _replace_). Connection uniqueness policy to enforce. To avoid multiple connections from the same user, a uniqueness policy can be enforced. The value _never_ does never enforce such a policy, even if a peer included INITIAL_CONTACT notification messages, whereas _no_ replaces existing connections for the same identity if a new one has the INITIAL_CONTACT notify. _keep_ rejects new connection attempts if the same user already has an active connection, _replace_ deletes any existing connection if a new one for the same user gets established. To compare connections for uniqueness, the remote IKE identity is used. If EAP or XAuth authentication is involved, the EAP-Identity or XAuth username is used to enforce the uniqueness policy instead. On initiators this setting specifies whether an INITIAL_CONTACT notify is sent during IKE_AUTH if no existing connection is found with the remote peer (determined by the identities of the first authentication round). Only if set to _keep_ or _replace_ will the client send a notify. connections..reauth_time = 0s Time to schedule IKE reauthentication. Time to schedule IKE reauthentication. IKE reauthentication recreates the IKE/ISAKMP SA from scratch and re-evaluates the credentials. In asymmetric configurations (with EAP or configuration payloads) it might not be possible to actively reauthenticate as responder. The IKEv2 reauthentication lifetime negotiation can instruct the client to perform reauthentication. Reauthentication is disabled by default. Enabling it usually may lead to small connection interruptions, as strongSwan uses a break-before-make policy with IKEv2 to avoid any conflicts with associated tunnel resources. connections..rekey_time = 4h Time to schedule IKE rekeying. IKE rekeying refreshes key material using a Diffie-Hellman exchange, but does not re-check associated credentials. It is supported in IKEv2 only, IKEv1 performs a reauthentication procedure instead. With the default value IKE rekeying is scheduled every 4 hours, minus the configured **rand_time**. If a **reauth_time** is configured, **rekey_time** defaults to zero disabling rekeying; explicitly set both to enforce rekeying and reauthentication. connections..over_time = 10% of rekey_time/reauth_time Hard IKE_SA lifetime if rekey/reauth does not complete, as time. Hard IKE_SA lifetime if rekey/reauth does not complete, as time. To avoid having an IKE/ISAKMP kept alive if IKE reauthentication or rekeying fails perpetually, a maximum hard lifetime may be specified. If the IKE_SA fails to rekey or reauthenticate within the specified time, the IKE_SA gets closed. In contrast to CHILD_SA rekeying, **over_time** is relative in time to the **rekey_time** _and_ **reauth_time** values, as it applies to both. The default is 10% of the longer of **rekey_time** and **reauth_time**. connections..rand_time = over_time Range of random time to subtract from rekey/reauth times. Time range from which to choose a random value to subtract from rekey/reauth times. To avoid having both peers initiating the rekey/reauth procedure simultaneously, a random time gets subtracted from the rekey/reauth times. The default is equal to the configured **over_time**. connections..pools = Comma separated list of named IP pools. Comma separated list of named IP pools to allocate virtual IP addresses and other configuration attributes from. Each name references a pool by name from either the **pools** section or an external pool. connections..local {} Section for a local authentication round. Section for a local authentication round. A local authentication round defines the rules how authentication is performed for the local peer. Multiple rounds may be defined to use IKEv2 RFC 4739 Multiple Authentication or IKEv1 XAuth. Each round is defined in a section having _local_ as prefix, and an optional unique suffix. To define a single authentication round, the suffix may be omitted. connections..local.round = 0 Optional numeric identifier by which authentication rounds are sorted. If not specified rounds are ordered by their position in the config file/VICI message. connections..local.certs = Comma separated list of certificate candidates to use for authentication. Comma separated list of certificate candidates to use for authentication. The certificates may use a relative path from the **swanctl** _x509_ directory or an absolute path. The certificate used for authentication is selected based on the received certificate request payloads. If no appropriate CA can be located, the first certificate is used. connections..local.pubkeys = Comma separated list of raw public key candidates to use for authentication. Comma separated list of raw public key candidates to use for authentication. The public keys may use a relative path from the **swanctl** _pubkey_ directory or an absolute path. Even though multiple local public keys could be defined in principle, only the first public key in the list is used for authentication. connections..local.auth = pubkey Authentication to perform locally (_pubkey_, _psk_, _xauth[-backend]_ or _eap[-method]_). Authentication to perform locally. _pubkey_ uses public key authentication using a private key associated to a usable certificate. _psk_ uses pre-shared key authentication. The IKEv1 specific _xauth_ is used for XAuth or Hybrid authentication, while the IKEv2 specific _eap_ keyword defines EAP authentication. For _xauth_, a specific backend name may be appended, separated by a dash. The appropriate _xauth_ backend is selected to perform the XAuth exchange. For traditional XAuth, the _xauth_ method is usually defined in the second authentication round following an initial _pubkey_ (or _psk_) round. Using _xauth_ in the first round performs Hybrid Mode client authentication. For _eap_, a specific EAP method name may be appended, separated by a dash. An EAP module implementing the appropriate method is selected to perform the EAP conversation. If both peers support RFC 7427 ("Signature Authentication in IKEv2") specific hash algorithms to be used during IKEv2 authentication may be configured. To do so use _ike:_ followed by a trust chain signature scheme constraint (see description of the **remote** section's **auth** keyword). For example, with _ike:pubkey-sha384-sha256_ a public key signature scheme with either SHA-384 or SHA-256 would get used for authentication, in that order and depending on the hash algorithms supported by the peer. If no specific hash algorithms are configured, the default is to prefer an algorithm that matches or exceeds the strength of the signature key. If no constraints with _ike:_ prefix are configured any signature scheme constraint (without _ike:_ prefix) will also apply to IKEv2 authentication, unless this is disabled in **strongswan.conf**(5). connections..local.id = IKE identity to use for authentication round. IKE identity to use for authentication round. When using certificate authentication, the IKE identity must be contained in the certificate, either as subject or as subjectAltName. The identity can be an IP address, a fully-qualified domain name, an email address or a Distinguished Name for which the ID type is determined automatically and the string is converted to the appropriate encoding. To enforce a specific identity type, a prefix may be used, followed by a colon (:). If the number sign (#) follows the colon, the remaining data is interpreted as hex encoding, otherwise the string is used as-is as the identification data. Note that this implies that no conversion is performed for non-string identities. For example, _ipv4:10.0.0.1_ does not create a valid ID_IPV4_ADDR IKE identity, as it does not get converted to binary 0x0a000001. Instead, one could use _ipv4:#0a000001_ to get a valid identity, but just using the implicit type with automatic conversion is usually simpler. The same applies to the ASN1 encoded types. The following prefixes are known: _ipv4_, _ipv6_, _rfc822_, _email_, _userfqdn_, _fqdn_, _dns_, _asn1dn_, _asn1gn_ and _keyid_. Custom type prefixes may be specified by surrounding the numerical type value by curly brackets. connections..local.eap_id = id Client EAP-Identity to use in EAP-Identity exchange and the EAP method. connections..local.aaa_id = remote-id Server side EAP-Identity to expect in the EAP method. Server side EAP-Identity to expect in the EAP method. Some EAP methods, such as EAP-TLS, use an identity for the server to perform mutual authentication. This identity may differ from the IKE identity, especially when EAP authentication is delegated from the IKE responder to an AAA backend. For EAP-(T)TLS, this defines the identity for which the server must provide a certificate in the TLS exchange. connections..local.xauth_id = id Client XAuth username used in the XAuth exchange. connections..remote {} Section for a remote authentication round. Section for a remote authentication round. A remote authentication round defines the constraints how the peers must authenticate to use this connection. Multiple rounds may be defined to use IKEv2 RFC 4739 Multiple Authentication or IKEv1 XAuth. Each round is defined in a section having _remote_ as prefix, and an optional unique suffix. To define a single authentication round, the suffix may be omitted. connections..remote.round = 0 Optional numeric identifier by which authentication rounds are sorted. If not specified rounds are ordered by their position in the config file/VICI message. connections..remote.id = %any IKE identity to expect for authentication round. IKE identity to expect for authentication round. Refer to the _local_ _id_ section for details. connections..remote.groups = Authorization group memberships to require. Comma separated authorization group memberships to require. The peer must prove membership to at least one of the specified groups. Group membership can be certified by different means, for example by appropriate Attribute Certificates or by an AAA backend involved in the authentication. connections..remote.certs = Comma separated list of certificate to accept for authentication. Comma separated list of certificates to accept for authentication. The certificates may use a relative path from the **swanctl** _x509_ directory or an absolute path. connections..remote.cacerts = Comma separated list of CA certificates to accept for authentication. Comma separated list of CA certificates to accept for authentication. The certificates may use a relative path from the **swanctl** _x509ca_ directory or an absolute path. connections..remote.pubkeys = Comma separated list of raw public keys to accept for authentication. Comma separated list of raw public keys to accept for authentication. The public keys may use a relative path from the **swanctl** _pubkey_ directory or an absolute path. connections..remote.revocation = relaxed Certificate revocation policy, (_strict_, _ifuri_ or _relaxed_). Certificate revocation policy for CRL or OCSP revocation. A _strict_ revocation policy fails if no revocation information is available, i.e. the certificate is not known to be unrevoked. _ifuri_ fails only if a CRL/OCSP URI is available, but certificate revocation checking fails, i.e. there should be revocation information available, but it could not be obtained. The default revocation policy _relaxed_ fails only if a certificate is revoked, i.e. it is explicitly known that it is bad. connections..remote.auth = pubkey Authentication to expect from remote (_pubkey_, _psk_, _xauth[-backend]_ or _eap[-method]_). Authentication to expect from remote. See the **local** section's **auth** keyword description about the details of supported mechanisms. To require a trustchain public key strength for the remote side, specify the key type followed by the minimum strength in bits (for example _ecdsa-384_ or _rsa-2048-ecdsa-256_). To limit the acceptable set of hashing algorithms for trustchain validation, append hash algorithms to _pubkey_ or a key strength definition (for example _pubkey-sha1-sha256_ or _rsa-2048-ecdsa-256-sha256-sha384-sha512_). Unless disabled in **strongswan.conf**(5), or explicit IKEv2 signature constraints are configured (refer to the description of the **local** section's **auth** keyword for details), such key types and hash algorithms are also applied as constraints against IKEv2 signature authentication schemes used by the remote side. To specify trust chain constraints for EAP-(T)TLS, append a colon to the EAP method, followed by the key type/size and hash algorithm as discussed above (e.g. _eap-tls:ecdsa-384-sha384_). connections..children. {} CHILD_SA configuration sub-section. CHILD_SA configuration sub-section. Each connection definition may have one or more sections in its _children_ subsection. The section name defines the name of the CHILD_SA configuration, which must be unique within the connection. connections..children..ah_proposals = AH proposals to offer for the CHILD_SA. AH proposals to offer for the CHILD_SA. A proposal is a set of algorithms. For AH, this includes an integrity algorithm and an optional Diffie-Hellman group. If a DH group is specified, CHILD_SA/Quick Mode rekeying and initial negotiation uses a separate Diffie-Hellman exchange using the specified group (refer to _esp_proposals_ for details). In IKEv2, multiple algorithms of the same kind can be specified in a single proposal, from which one gets selected. In IKEv1, only one algorithm per kind is allowed per proposal, more algorithms get implicitly stripped. Use multiple proposals to offer different algorithms combinations in IKEv1. Algorithm keywords get separated using dashes. Multiple proposals may be separated by commas. The special value _default_ forms a default proposal of supported algorithms considered safe, and is usually a good choice for interoperability. By default no AH proposals are included, instead ESP is proposed. connections..children..esp_proposals = default ESP proposals to offer for the CHILD_SA. ESP proposals to offer for the CHILD_SA. A proposal is a set of algorithms. For ESP non-AEAD proposals, this includes an integrity algorithm, an encryption algorithm, an optional Diffie-Hellman group and an optional Extended Sequence Number Mode indicator. For AEAD proposals, a combined mode algorithm is used instead of the separate encryption/integrity algorithms. If a DH group is specified, CHILD_SA/Quick Mode rekeying and initial negotiation use a separate Diffie-Hellman exchange using the specified group. However, for IKEv2, the keys of the CHILD_SA created implicitly with the IKE_SA will always be derived from the IKE_SA's key material. So any DH group specified here will only apply when the CHILD_SA is later rekeyed or is created with a separate CREATE_CHILD_SA exchange. A proposal mismatch might, therefore, not immediately be noticed when the SA is established, but may later cause rekeying to fail. Extended Sequence Number support may be indicated with the _esn_ and _noesn_ values, both may be included to indicate support for both modes. If omitted, _noesn_ is assumed. In IKEv2, multiple algorithms of the same kind can be specified in a single proposal, from which one gets selected. In IKEv1, only one algorithm per kind is allowed per proposal, more algorithms get implicitly stripped. Use multiple proposals to offer different algorithms combinations in IKEv1. Algorithm keywords get separated using dashes. Multiple proposals may be separated by commas. The special value _default_ forms a default proposal of supported algorithms considered safe, and is usually a good choice for interoperability. If no algorithms are specified for AH nor ESP, the _default_ set of algorithms for ESP is included. connections..children..local_ts = dynamic Local traffic selectors to include in CHILD_SA. Comma separated list of local traffic selectors to include in CHILD_SA. Each selector is a CIDR subnet definition, followed by an optional proto/port selector. The special value _dynamic_ may be used instead of a subnet definition, which gets replaced by the tunnel outer address or the virtual IP, if negotiated. This is the default. A protocol/port selector is surrounded by opening and closing square brackets. Between these brackets, a numeric or **getservent**(3) protocol name may be specified. After the optional protocol restriction, an optional port restriction may be specified, separated by a slash. The port restriction may be numeric, a **getservent**(3) service name, or the special value _opaque_ for RFC 4301 OPAQUE selectors. Port ranges may be specified as well, none of the kernel backends currently support port ranges, though. Unless the Unity extension is used, IKEv1 supports the first specified selector only. IKEv1 uses very similar traffic selector narrowing as it is supported in the IKEv2 protocol. connections..children..remote_ts = dynamic Remote selectors to include in CHILD_SA. Comma separated list of remote selectors to include in CHILD_SA. See **local_ts** for a description of the selector syntax. connections..children..rekey_time = 1h Time to schedule CHILD_SA rekeying. Time to schedule CHILD_SA rekeying. CHILD_SA rekeying refreshes key material, optionally using a Diffie-Hellman exchange if a group is specified in the proposal. To avoid rekey collisions initiated by both ends simultaneously, a value in the range of **rand_time** gets subtracted to form the effective soft lifetime. By default CHILD_SA rekeying is scheduled every hour, minus **rand_time**. connections..children..life_time = rekey_time + 10% Maximum lifetime before CHILD_SA gets closed, as time. Maximum lifetime before CHILD_SA gets closed. Usually this hard lifetime is never reached, because the CHILD_SA gets rekeyed before. If that fails for whatever reason, this limit closes the CHILD_SA. The default is 10% more than the **rekey_time**. connections..children..rand_time = life_time - rekey_time Range of random time to subtract from **rekey_time**. Time range from which to choose a random value to subtract from **rekey_time**. The default is the difference between **life_time** and **rekey_time**. connections..children..rekey_bytes = 0 Number of bytes processed before initiating CHILD_SA rekeying. Number of bytes processed before initiating CHILD_SA rekeying. CHILD_SA rekeying refreshes key material, optionally using a Diffie-Hellman exchange if a group is specified in the proposal. To avoid rekey collisions initiated by both ends simultaneously, a value in the range of **rand_bytes** gets subtracted to form the effective soft volume limit. Volume based CHILD_SA rekeying is disabled by default. connections..children..life_bytes = rekey_bytes + 10% Maximum bytes processed before CHILD_SA gets closed. Maximum bytes processed before CHILD_SA gets closed. Usually this hard volume limit is never reached, because the CHILD_SA gets rekeyed before. If that fails for whatever reason, this limit closes the CHILD_SA. The default is 10% more than **rekey_bytes**. connections..children..rand_bytes = life_bytes - rekey_bytes Range of random bytes to subtract from **rekey_bytes**. Byte range from which to choose a random value to subtract from **rekey_bytes**. The default is the difference between **life_bytes** and **rekey_bytes**. connections..children..rekey_packets = 0 Number of packets processed before initiating CHILD_SA rekeying. Number of packets processed before initiating CHILD_SA rekeying. CHILD_SA rekeying refreshes key material, optionally using a Diffie-Hellman exchange if a group is specified in the proposal. To avoid rekey collisions initiated by both ends simultaneously, a value in the range of **rand_packets** gets subtracted to form the effective soft packet count limit. Packet count based CHILD_SA rekeying is disabled by default. connections..children..life_packets = rekey_packets + 10% Maximum number of packets processed before CHILD_SA gets closed. Maximum number of packets processed before CHILD_SA gets closed. Usually this hard packets limit is never reached, because the CHILD_SA gets rekeyed before. If that fails for whatever reason, this limit closes the CHILD_SA. The default is 10% more than **rekey_bytes**. connections..children..rand_packets = life_packets - rekey_packets Range of random packets to subtract from **packets_bytes**. Packet range from which to choose a random value to subtract from **rekey_packets**. The default is the difference between **life_packets** and **rekey_packets**. connections..children..updown = Updown script to invoke on CHILD_SA up and down events. connections..children..hostaccess = yes Hostaccess variable to pass to **updown** script. connections..children..mode = tunnel IPsec Mode to establish (_tunnel_, _transport_, _beet_, _pass_ or _drop_). IPsec Mode to establish CHILD_SA with. _tunnel_ negotiates the CHILD_SA in IPsec Tunnel Mode, whereas _transport_ uses IPsec Transport Mode. _beet_ is the Bound End to End Tunnel mixture mode, working with fixed inner addresses without the need to include them in each packet. Both _transport_ and _beet_ modes are subject to mode negotiation; _tunnel_ mode is negotiated if the preferred mode is not available. _pass_ and _drop_ are used to install shunt policies which explicitly bypass the defined traffic from IPsec processing or drop it, respectively. connections..children..policies = yes Whether to install IPsec policies or not. Whether to install IPsec policies or not. Disabling this can be useful in some scenarios e.g. MIPv6, where policies are not managed by the IKE daemon. connections..children..policies_fwd_out = no Whether to install outbound FWD IPsec policies or not. Whether to install outbound FWD IPsec policies or not. Enabling this is required in case there is a drop policy that would match and block forwarded traffic for this CHILD_SA. connections..children..dpd_action = clear Action to perform on DPD timeout (_clear_, _trap_ or _restart_). Action to perform for this CHILD_SA on DPD timeout. The default _clear_ closes the CHILD_SA and does not take further action. _trap_ installs a trap policy, which will catch matching traffic and tries to re-negotiate the tunnel on-demand. _restart_ immediately tries to re-negotiate the CHILD_SA under a fresh IKE_SA. connections..children..ipcomp = no Enable IPComp compression before encryption. Enable IPComp compression before encryption. If enabled, IKE tries to negotiate IPComp compression to compress ESP payload data prior to encryption. connections..children..inactivity = 0s Timeout before closing CHILD_SA after inactivity. Timeout before closing CHILD_SA after inactivity. If no traffic has been processed in either direction for the configured timeout, the CHILD_SA gets closed due to inactivity. The default value of _0_ disables inactivity checks. connections..children..reqid = 0 Fixed reqid to use for this CHILD_SA. Fixed reqid to use for this CHILD_SA. This might be helpful in some scenarios, but works only if each CHILD_SA configuration is instantiated not more than once. The default of _0_ uses dynamic reqids, allocated incrementally. connections..children..priority = 0 Optional fixed priority for IPsec policies. Optional fixed priority for IPsec policies. This could be useful to install high-priority drop policies. The default of _0_ uses dynamically calculated priorities based on the size of the traffic selectors. connections..children..interface = Optional interface name to restrict IPsec policies. connections..children..mark_in = 0/0x00000000 Netfilter mark and mask for input traffic. Netfilter mark and mask for input traffic. On Linux Netfilter may require marks on each packet to match an SA having that option set. This allows Netfilter rules to select specific tunnels for incoming traffic. The special value _%unique_ sets a unique mark on each CHILD_SA instance. An additional mask may be appended to the mark, separated by _/_. The default mask if omitted is 0xffffffff. connections..children..mark_out = 0/0x00000000 Netfilter mark and mask for output traffic. Netfilter mark and mask for output traffic. On Linux Netfilter may require marks on each packet to match a policy having that option set. This allows Netfilter rules to select specific tunnels for outgoing traffic. The special value _%unique_ sets a unique mark on each CHILD_SA instance. An additional mask may be appended to the mark, separated by _/_. The default mask if omitted is 0xffffffff. connections..children..tfc_padding = 0 Traffic Flow Confidentiality padding. Pads ESP packets with additional data to have a consistent ESP packet size for improved Traffic Flow Confidentiality. The padding defines the minimum size of all ESP packets sent. The default value of 0 disables TFC padding, the special value _mtu_ adds TFC padding to create a packet size equal to the Path Maximum Transfer Unit. connections..children..replay_window = 32 IPsec replay window to configure for this CHILD_SA. IPsec replay window to configure for this CHILD_SA. Larger values than the default of 32 are supported using the Netlink backend only, a value of 0 disables IPsec replay protection. connections..children..start_action = none Action to perform after loading the configuration (_none_, _trap_, _start_). Action to perform after loading the configuration. The default of _none_ loads the connection only, which then can be manually initiated or used as a responder configuration. The value _trap_ installs a trap policy, which triggers the tunnel as soon as matching traffic has been detected. The value _start_ initiates the connection actively. When unloading or replacing a CHILD_SA configuration having a **start_action** different from _none_, the inverse action is performed. Configurations with _start_ get closed, while such with _trap_ get uninstalled. connections..children..close_action = none Action to perform after a CHILD_SA gets closed (_none_, _trap_, _start_). Action to perform after a CHILD_SA gets closed by the peer. The default of _none_ does not take any action, _trap_ installs a trap policy for the CHILD_SA. _start_ tries to re-create the CHILD_SA. **close_action** does not provide any guarantee that the CHILD_SA is kept alive. It acts on explicit close messages only, but not on negotiation failures. Use trap policies to reliably re-create failed CHILD_SAs. secrets { # } Section defining secrets for IKE/EAP/XAuth authentication and private key decryption. Section defining secrets for IKE/EAP/XAuth authentication and private key decryption. The **secrets** section takes sub-sections having a specific prefix which defines the secret type. It is not recommended to define any private key decryption passphrases, as then there is no real security benefit in having encrypted keys. Either store the key unencrypted or enter the keys manually when loading credentials. secrets.eap { # } EAP secret section for a specific secret. EAP secret section for a specific secret. Each EAP secret is defined in a unique section having the _eap_ prefix. EAP secrets are used for XAuth authentication as well. secrets.xauth { # } XAuth secret section for a specific secret. XAuth secret section for a specific secret. **xauth** is just an alias for **eap**, secrets under both section prefixes are used for both EAP and XAuth authentication. secrets.eap.secret = Value of the EAP/XAuth secret. Value of the EAP/XAuth secret. It may either be an ASCII string, a hex encoded string if it has a _0x_ prefix or a Base64 encoded string if it has a _0s_ prefix in its value. secrets.eap.id = Identity the EAP/XAuth secret belongs to. Identity the EAP/XAuth secret belongs to. Multiple unique identities may be specified, each having an _id_ prefix, if a secret is shared between multiple users. secrets.ike { # } IKE preshared secret section for a specific secret. IKE preshared secret section for a specific secret. Each IKE PSK is defined in a unique section having the _ike_ prefix. secrets.ike.secret = Value of the IKE preshared secret. Value of the IKE preshared secret. It may either be an ASCII string, a hex encoded string if it has a _0x_ prefix or a Base64 encoded string if it has a _0s_ prefix in its value. secrets.ike.id = IKE identity the IKE preshared secret belongs to. IKE identity the IKE preshared secret belongs to. Multiple unique identities may be specified, each having an _id_ prefix, if a secret is shared between multiple peers. secrets.private { # } Private key decryption passphrase for a key in the _private_ folder. secrets.private.file = File name in the _private_ folder for which this passphrase should be used. secrets.private.secret Value of decryption passphrase for private key. secrets.rsa { # } Private key decryption passphrase for a key in the _rsa_ folder. secrets.rsa.file = File name in the _rsa_ folder for which this passphrase should be used. secrets.rsa.secret Value of decryption passphrase for RSA key. secrets.ecdsa { # } Private key decryption passphrase for a key in the _ecdsa_ folder. secrets.ecdsa.file = File name in the _ecdsa_ folder for which this passphrase should be used. secrets.ecdsa.secret Value of decryption passphrase for ECDSA key. secrets.pkcs8 { # } Private key decryption passphrase for a key in the _pkcs8_ folder. secrets.pkcs8.file = File name in the _pkcs8_ folder for which this passphrase should be used. secrets.pkcs8.secret Value of decryption passphrase for PKCS#8 key. secrets.pkcs12 { # } PKCS#12 decryption passphrase for a container in the _pkcs12_ folder. secrets.pkcs12.file = File name in the _pkcs12_ folder for which this passphrase should be used. secrets.pkcs12.secret Value of decryption passphrase for PKCS#12 container. pools { # } Section defining named pools. Section defining named pools. Named pools may be referenced by connections with the **pools** option to assign virtual IPs and other configuration attributes. pools. { # } Section defining a single pool with a unique name. pools..addrs = Addresses allocated in pool. Subnet or range defining addresses allocated in pool. Accepts a single CIDR subnet defining the pool to allocate addresses from or an address range (-). Pools must be unique and non-overlapping. pools.. = Comma separated list of additional attributes from type . Comma separated list of additional attributes of type ****. The attribute type may be one of _dns_, _nbns_, _dhcp_, _netmask_, _server_, _subnet_, _split_include_ and _split_exclude_ to define addresses or CIDR subnets for the corresponding attribute types. Alternatively, **** can be a numerical identifier, for which string attribute values are accepted as well. authorities { # } Section defining attributes of certification authorities. authorities. { # } Section defining a certification authority with a unique name. authorities..cacert = CA certificate belonging to the certification authority. The certificates may use a relative path from the **swanctl** _x509ca_ directory or an absolute path. authorities..crl_uris = Comma-separated list of CRL distribution points Comma-separated list of CRL distribution points (ldap, http, or file URI) authorities..ocsp_uris = Comma-separated list of OCSP URIs Comma-separated list of OCSP URIs authorities..cert_uri_base = Defines the base URI for the Hash and URL feature supported by IKEv2. Defines the base URI for the Hash and URL feature supported by IKEv2. Instead of exchanging complete certificates, IKEv2 allows one to send an URI that resolves to the DER encoded certificate. The certificate URIs are built by appending the SHA1 hash of the DER encoded certificates to this base URI.