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Currently supports transport mode connections using IPv4 only, and requires
a unique mark configured on the connection.
To select the correct outbound SA when multiple connections match (i.e.
multiple peers connected from the same IP address / NAT router) marks must be
configured. This mark should usually be unique, which can be configured in
ipsec.conf using mark=0xffffffff.
The plugin inserts CONNMARK netfilter target rules: Any peer-initiated flow
is tagged with the assigned mark as connmark. On the return path, the mark
gets restored from the conntrack entry to select the correct outbound SA.
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