Thanks for the reply. One of my colleagues had logged a TAC case recently and the advise was to redesign OSPF networking to reduce size of DBD packets and prevent fragmentation.
I accept this as a valid recommendation - the network does need work but was also looking for real life experiences where people had fixed similar issues.
I am looking at introducing another OSPF area and summarising as many routes as possible. I am also investigating / confirming MTU sizes on switch between ASA and FWSM. Based on some other research I am wondering whether I can increase MTU on FWSM,ASA and the interconnecting 3750 to alleviate issue.
The ASA has another neighbour with no problems - but very few routes recieved on the other network.
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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...