i have site to site tunnel between a router (IOS 12.4) and ASA (8.0(3)).
the tunnel is passing a router which is doing patting .
i thought the tunnel was running by nat traversal over udp 4500 by default, but that was not correct.
but when i monitored the translation table over the pat router i found esp traffic is being translated with a strange port number, how that is possible since the esp packet has no port and as i know it should not work with pat without a layer 4 header.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...