Hi all :-) Finally managed to get my subnet.. but I have a small problem.. my tunnel endpoint is a cisco836 tunel is up and working lets see... dsl#ping deham01 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2001:6F8:900:7AA::1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 76/79/84 ms dsl#ping deham01 source e0 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2001:6F8:900:7AA::1, timeout is 2 seconds: Packet sent with a source address of 2001:6F8:1005::1 !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 76/79/80 ms dsl# Cool it works.. lets try some more dsl#ping noc.sixxs.net Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2001:838:1:1:210:DCFF:FE20:7C7C, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 180/184/188 ms dsl# Works too :-) Even Better.. and Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2001:838:1:1:210:DCFF:FE20:7C7C, timeout is 2 seconds: Packet sent with a source address of 2001:6F8:1005::1 ..... Success rate is 0 percent (0/5) dsl# ups... so whats wrong.. lets see my routing ipv6 route 2001:6F8:1005::/48 Null0 ipv6 route 2000::/3 2001:6F8:900:7AA::1 Must be working because but better check it dsl#sh run | i ipv6 route ipv6 route 2001:6F8:1005::/48 Null0 ipv6 route 2000::/3 2001:6F8:900:7AA::1 dsl#conf t Enter configuration commands, one per line. End with CNTL/Z. dsl(config)#no ipv6 route 2000::/3 2001:6F8:900:7AA::1 dsl(config)#end dsl#ping noc.sixxs.net Sending 5, 100-byte ICMP Echos to 2001:838:1:1:210:DCFF:FE20:7C7C, timeout is 2 seconds: ..... Success rate is 0 percent (0/5) dsl#conf t Enter configuration commands, one per line. End with CNTL/Z. dsl(config)#ipv6 route 2000::/3 2001:6F8:900:7AA::1 dsl(config)#end dsl#ping noc.sixxs.net Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2001:838:1:1:210:DCFF:FE20:7C7C, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 184/198/204 ms dsl# ok lets see if I got a acls.. nterface Tunnel0 description IPv6 uplink to SixXS no ip address ipv6 address 2001:6F8:900:7AA::2/64 ipv6 enable ipv6 mtu 1280 keepalive 10 3 tunnel source Loopback1 tunnel destination 212.224.0.188 tunnel mode ipv6ip end nope.. I disabled ipv6 to troubleshoot.. so enabling cef didn't work ether.. btw. traceroute checking via sixx.net did tell me the same.. Is there a routing problem or is there a fault i didn't get? Thanks for your comments..