Hi everyboy, at home i have this scenario: dynamic ip adsl, 1 Cisco 827 router, ipv6 capable, natting the internal lan. 1 notebook win Xp s.p. 2 1 desktop pc Fedora Core 6. No particular access-lists are applied (beside the security ones) on the router side. But, just to be sure, i removed all access-lists before i run all the tests. The notebook (win xp) works just fine, layer 3 ok, ping, traceroute ok. up to layer 7 everything works ok: irc, audio streaming, telnet, ftp, mail , web browsing (altough the only ipv6 capable browser seems to be Opera - IE and firefox just sit there without reaching the ipv6 web server or when this happens it's only trhough ipv4). The problem is with the linux pc, launching the aiccu daemon (after stopping it on the win notebook of course) everything seems to be ok, no error messages. layer 3 ok! i can ping, i can trace. no problem. I can also successfully ping6 the hostnames e.g. www.kame.net, so my provider's dns is ipv6 compliant. Routing table ok, the pc has its default route via sixxs interface. Seems it can reach any public ipv6 in the world. But that's the only thing i can do. If i launch "opera -debugdns" i can see that the hostnames are resolved fine to their corresponding ipv6, but no browsing, no ircing, no audio streaming and so on, nothing! I tried to reload everything, router , pc, notebook. Starting the daemon on the linux pc first, with the same exact result. Stopping it and then launching it on the win xp notebook everything works ok. Did anybody have the same problem? or some hints? Any help would be very appreciated, thanks in advance. Hope i made myself clear enough, bye! Stefano