I've got some strange routing problem around here at the router box. Every box behind it (in the subnet) can use v6 perfectly. here is a dump of the sixxs interface: 23:20:39.463340 cl-195.ham-01.de.sixxs.net > gw-195.ham-01.de.sixxs.net: icmp6: echo request seq 1 (len 64, hlim 64) 23:20:39.510627 gw-195.ham-01.de.sixxs.net > cl-195.ham-01.de.sixxs.net: icmp6: echo reply seq 1 (len 64, hlim 64) 23:20:39.510805 fe80::ac1e:2122 > gw-195.ham-01.de.sixxs.net: icmp6: redirect cl-195.ham-01.de.sixxs.net to cl-195.ham-01.de.sixxs.net(tgt lladdr: 00:00:00:00:00:00)[ndp opt] (len 160, hlim 255) 23:20:39.510975 gw-195.ham-01.de.sixxs.net > cl-195.ham-01.de.sixxs.net: icmp6: echo reply seq 1 (len 64, hlim 63) 23:20:39.569653 gw-195.ham-01.de.sixxs.net > cl-195.ham-01.de.sixxs.net: icmp6: echo reply seq 1 (len 64, hlim 62) 23:20:39.569842 fe80::ac1e:2122 > gw-195.ham-01.de.sixxs.net: icmp6: redirect cl-195.ham-01.de.sixxs.net to cl-195.ham-01.de.sixxs.net(tgt lladdr: 00:00:00:00:00:00)[ndp opt] (len 160, hlim 255) 23:20:39.570013 gw-195.ham-01.de.sixxs.net > cl-195.ham-01.de.sixxs.net: icmp6: echo reply seq 1 (len 64, hlim 61) 23:20:39.627603 gw-195.ham-01.de.sixxs.net > cl-195.ham-01.de.sixxs.net: icmp6: echo reply seq 1 (len 64, hlim 60) 23:20:39.627759 fe80::ac1e:2122 > gw-195.ham-01.de.sixxs.net: icmp6: redirect cl-195.ham-01.de.sixxs.net to cl-195.ham-01.de.sixxs.net(tgt lladdr: 00:00:00:00:00:00)[ndp opt] (len 160, hlim 255) 23:20:39.627915 gw-195.ham-01.de.sixxs.net > cl-195.ham-01.de.sixxs.net: icmp6: echo reply seq 1 (len 64, hlim 59) 23:20:39.686577 gw-195.ham-01.de.sixxs.net > cl-195.ham-01.de.sixxs.net: icmp6: echo reply seq 1 (len 64, hlim 58) [blah.blah.. just hlim decreasing, no more redirects] 23:20:40.987766 gw-195.ham-01.de.sixxs.net > cl-195.ham-01.de.sixxs.net: icmp6: echo reply seq 1 (len 64, hlim 3) 23:20:41.034540 gw-195.ham-01.de.sixxs.net > cl-195.ham-01.de.sixxs.net: icmp6: echo reply seq 1 (len 64, hlim 2) 23:20:41.034698 gw-195.ham-01.de.sixxs.net > cl-195.ham-01.de.sixxs.net: icmp6: echo reply seq 1 [hlim 1] (len 64) the same applies backward, when the gw ping the cl. And an XP box behind it traces noc.sixxs.net: Tracing route to noc.sixxs.net [2001:838:1:1:210:dcff:fe20:7c7c] over a maximum of 30 hops: 1 <1 ms <1 ms <1 ms vlan1-v6-gw.otthon.urbnet.hu [2001:6f8:120e:0:2c 0:f0ff:fe55:72d4] 2 48 ms 46 ms 46 ms gw-195.ham-01.de.sixxs.net [2001:6f8:900:c2::1] [blah..blah] 14 67 ms 67 ms 67 ms se1.breda.ipv6.concepts-ict.net [2001:838:0:10:: 2] 15 71 ms 67 ms 66 ms noc.sixxs.net [2001:838:1:1:210:dcff:fe20:7c7c] do you know what is it?