I have a site to site VPN over a DSL. My DSL line terminates on an 877 router on the one end and a pix 506 on the other end. I have a site-to-site VPN from an ASA on the other side of the 877 and the 506. I have having problems running certain application across this VPN and I believe it is related to the MTU permitted over DSL. I know on the 877 you can use the ip tcp adjust mss to change the MTU to the required size, but I have done this and it doesn't appear to have helped. Is it possible to adjust the MTU on the ASA or on the site-to-site VPN config to get this to work?
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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...