My Problem includes tunnel T14229 and subnet R6108 at deham01. in the last 3 days, i've experienced routing problems. My endpoint is reachable traceroute to rt.w.xmw.de (2001:6f8:900:af2::2), 30 hops max, 40 byte packets 1 r2d2.m.xmw.de (2001:a60:f05b:0:21d:7eff:fe60:9156) 0.784 ms 1.567 ms 1.905 ms 2 gw-113.muc-02.de.sixxs.net (2001:a60:f000:70::1) 12.439 ms 17.612 ms 23.071 ms 3 rt4.muc1.m-online.net (2001:a60:0:200::1) 29.375 ms 34.256 ms 39.635 ms 4 fe6-0.er1.cwmuc.de.easynet.net (2001:7f8:2c:1000:0:a500:4589:1) 280.118 ms 280.466 ms 281.363 ms 5 fe6-0.er1.cwmuc.de.easynet.net (2001:7f8:2c:1000:0:a500:4589:1) 282.390 ms 283.071 ms 283.777 ms 6 ge1-3-0-35.br1.cwmuc.de.easynet.net (2001:6f8:800:0:1:0:c240:486) 97.018 ms 94.637 ms 100.228 ms 7 so1-3-0-0.br1.ixfra.de.easynet.net (2001:6f8:800:0:1:0:d4e0:401) 151.513 ms 147.017 ms 144.429 ms 8 ge1-14-120.br2.isham.de.easynet.net (2001:6f8:800:0:1:0:c240:454) 119.850 ms 116.616 ms 118.557 ms 9 ge7-1.cr20.isham.de.easynet.net (2001:6f8:800:0:1:0:d4e0:459) 120.236 ms 66.259 ms 64.486 ms 10 deham01.sixxs.net (2001:6f8:800:1003::2) 65.799 ms 47.586 ms 47.507 ms 11 cl-2803.ham-01.de.sixxs.net (2001:6f8:900:af2::2) 68.158 ms 66.499 ms 71.623 ms while the same machine as member of the subnet is not root@io:~# traceroute6 unimatrix.xmw.de traceroute to unimatrix.xmw.de (2001:6f8:1022:0:21d:92ff:fe39:3758), 30 hops max, 40 byte packets 1 r2d2.m.xmw.de (2001:a60:f05b:0:21d:7eff:fe60:9156) 0.822 ms 1.085 ms 1.864 ms 2 gw-113.muc-02.de.sixxs.net (2001:a60:f000:70::1) 12.326 ms 17.473 ms 23.116 ms 3 rt4.muc1.m-online.net (2001:a60:0:200::1) 29.514 ms 34.163 ms 39.540 ms 4 fe6-0.er1.cwmuc.de.easynet.net (2001:7f8:2c:1000:0:a500:4589:1) 45.222 ms 51.134 ms 55.795 ms 5 fe6-0.er1.cwmuc.de.easynet.net (2001:7f8:2c:1000:0:a500:4589:1) 60.913 ms 66.378 ms 71.253 ms 6 ge1-3-0-35.br1.cwmuc.de.easynet.net (2001:6f8:800:0:1:0:c240:486) 100.288 ms 96.741 ms 101.882 ms 7 so1-3-0-0.br1.ixfra.de.easynet.net (2001:6f8:800:0:1:0:d4e0:401) 107.271 ms 107.066 ms 109.158 ms 8 ge1-14-120.br2.isham.de.easynet.net (2001:6f8:800:0:1:0:c240:454) 120.161 ms 115.698 ms 118.201 ms 9 ge7-1.cr20.isham.de.easynet.net (2001:6f8:800:0:1:0:d4e0:459) 108.386 ms 113.263 ms 114.757 ms 10 deham01.sixxs.net (2001:6f8:800:1003::2) 117.960 ms 116.639 ms 118.408 ms 11 * * * 12 * * * 13 * * * 14 * * * The problem last for some hours and goes away afterwards without any cange at the configuration of the host. Both iptables were cempty and the os is Debian/lenny amd64. michael@unimatrix:~$ ip -4 addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue inet 127.0.0.1/8 scope host lo 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000 inet 85.10.194.146/27 brd 85.10.194.159 scope global eth0 inet 78.47.84.17/29 scope global eth0 inet 78.47.84.18/29 scope global secondary eth0 inet 78.47.84.19/29 scope global secondary eth0 inet 78.47.84.20/29 scope global secondary eth0 inet 78.47.84.21/29 scope global secondary eth0 inet 78.47.84.22/29 scope global secondary eth0 michael@unimatrix:~$ ip -6 addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000 inet6 2001:6f8:1022:0:cafe::2/64 scope global valid_lft forever preferred_lft forever inet6 2001:6f8:1022:0:cafe::1/64 scope global valid_lft forever preferred_lft forever inet6 2001:6f8:1022:0:21d:92ff:fe39:3758/128 scope global valid_lft forever preferred_lft forever inet6 fe80::21d:92ff:fe39:3758/64 scope link valid_lft forever preferred_lft forever 4: sixxs@NONE: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1280 inet6 2001:6f8:900:af2::2/64 scope global valid_lft forever preferred_lft forever inet6 fe80::4e2f:5416/64 scope link valid_lft forever preferred_lft forever inet6 fe80::4e2f:5415/64 scope link valid_lft forever preferred_lft forever inet6 fe80::4e2f:5414/64 scope link valid_lft forever preferred_lft forever inet6 fe80::4e2f:5413/64 scope link valid_lft forever preferred_lft forever inet6 fe80::4e2f:5412/64 scope link valid_lft forever preferred_lft forever inet6 fe80::4e2f:5411/64 scope link valid_lft forever preferred_lft forever inet6 fe80::550a:c292/64 scope link valid_lft forever preferred_lft forever I cannot find any message in the logs ore any process to cause this problem. best regards Michael Weber