Hello, we have a customer that has been working with us like 1 month with no problem. We did a connection between a fortigate firewall and a Cisco 2811. Now the tunnel is up but no traffic is going and coming through it. I did remake the whole configuration for this costumer: Key, cryptomap and access-list. The tunnel comes up but again, no traffic is coming or going.
The first thing that I would look at would be the access lists that define interesting traffic for encryption. Probably the most common cause of no traffic going over the tunnel is an incorrectly configured, or a mismatched access list.
If the tunnel comes up that would indicate that the peering, authentication, and IPSec policies match.
I find that the output of show crypto map can be helpful in resolving issues like this.
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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...