However, there's another option called Path MTU discovery. PMTUD is an optimization whereby a TCP connection attempts to send the longest packets that will not be fragmented along the path from source to destination. It does this by using a flag, DontFragment, in the IP packet. This flag is supposed to alter the behavior of an intermediate router that cannot send the packet across a link because it is too long. Normally the flag is off and the router should fragment the packet and send the fragments. But if the DontFragment flag is on, the router should discard the packet and return an error packet explaining the difficulty to the source of the original packet. PMTUD is a good idea in principle, but fragile in practice. With poor or badly configured TCP implementations and poorly-implemented routers or badly-configured firewalls, it can devolve to a persistent state in which each end of a TCP connection is waiting for the other end to say something.
The IntraPort line of products support Path MTU Discovery. This can be turned on by configuring the following Keyword=value pairs in the General section: PreTunnelFragmentation=true, and MTUDiscoveryTimeout=10 .
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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...