I don't understand the question. If you're talking about firewall vlan-groups on the switch/router, you only need 1 vlan-group for each fwsm (or failover pair), regardless of the number of contexts. Can you actually assign multiple firewall vlan-groups to a module?
If you're talking about the vlans in a firewall vlan-group, where does this information about the restriction come from? You could have 16 vlans for a single transparent context (with 8 bvi's), which would imply you could have 320 vlans w/20 contexts. I've never seen anything about a restriction related to vlan-groups.
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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...