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Diffstat (limited to 'docs/configuration/vpn/site2site_ipsec.rst')
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diff --git a/docs/configuration/vpn/site2site_ipsec.rst b/docs/configuration/vpn/site2site_ipsec.rst index e81c5c3b..9ddda340 100644 --- a/docs/configuration/vpn/site2site_ipsec.rst +++ b/docs/configuration/vpn/site2site_ipsec.rst @@ -344,3 +344,52 @@ Imagine the following topology set vpn ipsec site-to-site peer 172.18.201.10 local-address '172.18.202.10' set vpn ipsec site-to-site peer 172.18.201.10 vti bind 'vti10' set vpn ipsec site-to-site peer 172.18.201.10 vti esp-group 'ESP_DEFAULT' + +Key Parameters: + +* ``authentication local-id/remote-id`` - IKE identification is used for + validation of VPN peer devices during IKE negotiation. If you do not configure + local/remote-identity, the device uses the IPv4 or IPv6 address that + corresponds to the local/remote peer by default. + In certain network setups (like ipsec interface with dynamic address, or + behind the NAT ), the IKE ID received from the peer does not match the IKE + gateway configured on the device. This can lead to a Phase 1 validation + failure. + So, make sure to configure the local/remote id explicitly and ensure that the + IKE ID is the same as the remote-identity configured on the peer device. + +* ``disable-route-autoinstall`` - This option when configured disables the + routes installed in the default table 220 for site-to-site ipsec. + It is mostly used with VTI configuration. + +* ``dead-peer-detection action = clear | hold | restart`` - R_U_THERE + notification messages(IKEv1) or empty INFORMATIONAL messages (IKEv2) + are periodically sent in order to check the liveliness of the IPsec peer. The + values clear, hold, and restart all activate DPD and determine the action to + perform on a timeout. + With ``clear`` the connection is closed with no further actions taken. + ``hold`` installs a trap policy, which will catch matching traffic and tries + to re-negotiate the connection on demand. + ``restart`` will immediately trigger an attempt to re-negotiate the + connection. + +* ``close-action = none | clear | hold | restart`` - defines the action to take + if the remote peer unexpectedly closes a CHILD_SA (see above for meaning of + values). A closeaction should not be used if the peer uses reauthentication or + uniqueids. + + When the close-action option is set on the peers, the connection-type + of each peer has to considered carefully. For example, if the option is set + on both peers, then both would attempt to initiate and hold open multiple + copies of each child SA. This might lead to instability of the device or + cpu/memory utilization. + + Below flow-chart could be a quick reference for the close-action + combination depending on how the peer is configured. + +.. figure:: /_static/images/IPSec_site-to-site_IKE_configuration.png + :width: 50% + :align: center + + Similar combinations are applicable for the dead-peer-detection. + |