GRE tunnel with IPSEC can pass broadcast and multicast traffic. If you are running OSPF, RIP or other IGP through your VPN network, creat "tunnel" and apply the crytpo map to it, then you can pass all the routing protocols ( most of them using multicast). Video applications use multicast as well.
If you only use IPSEC(directly apply the crypto to the interface), that can only pass the unicast traffic. If you want to pass normal unicast ip traffic, this is a good choice as well.
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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...