I have a main site with a Cisco 3640 behind a Cisco Pix 515 Firewall. At my branch site I have a Cisco 1720. Has anyone else any experience/configs for setting up a GRE tunnel from the Cisco 3640 to the Cisco 1720 and encrypting it using the Main site PIX and the Branch site 1720. We currently do a lot IPSEC/GRE IOS - IOS, but do not have much experience doing this though a PIX. After having a go at the config a few months ago and kind of getting it working, for about 1 day, I have not had much more time to do this, or investigate if it is secure.
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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...