I have a working tunnel to sixxs from a Mac os X 10.3.4 Machine but when i try to establish a link on Mac os X 10.4 it doesnt work. I can ping6 myself: ping6 2001:770:100:41::2 PING6(56=40+8+8 bytes) 2001:770:100:41::2 --> 2001:770:100:41::2 16 bytes from 2001:770:100:41::2, icmp_seq=0 hlim=64 time=0.286 ms i can ping the pop (v4) but when i try to ping6 the pop it fails (unlike 10.3) ping6 2001:770:100:41::1 PING6(56=40+8+8 bytes) 2001:770:100:41::2 --> 2001:770:100:41::1 the output from ifconfig is the same as are the routing tables route get -inet6 default route to: :: destination: :: mask: default gateway: gw-66.dub-01.ie.sixxs.net interface: gif0 flags: <UP,GATEWAY,DONE,STATIC,PRCLONING> recvpipe sendpipe ssthresh rtt,msec rttvar hopcount mtu expire 0 0 0 0 0 0 1280 0 and ifconfig gif0 gif0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1280 tunnel inet 62.231.45.32 --> 193.1.31.74 inet6 fe80::230:65ff:fef4:3a7e prefixlen 64 scopeid 0x6 inet6 2001:770:100:41::2 --> 2001:770:100:41::1 prefixlen 128 I would be interested to hear from anyone who has a sixxs tunnel running on Mac OS X 10.4 or darwin8