static nat, and inbound acls need to be configured for pix outside interface on the dsl modem. further, it may not be feasible providing each site has only one public ip. the reason being that lan-lan vpn requires esp (i.e. ip 50), which is unlikely to be supported by port forwarding on dsl modem.
i would suggest you configure both dsl modem into bridging mode, and configure the static public ip directly on the pix outside interface. it would be less complicated to implement and manage.
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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...