Hi, I added a IPv6 support to a KVM virtualized Jessie system following the instructions by the hoster
https://www.netcup-wiki.de/wiki/Zus %c3%a4tzliche_IP_Adresse_konfigurieren#IPv6%7C I my case, I added (for me it looks a little weird that IPv4 gets configured via dhcp and IPv6 is a static configuration, but that is how I read the information in the wiki. After rebooting the system works nicely and shows ipv6 addresses and a routing table root@netcup:~# ip -6 addr show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000 inet6 2a03:4000:6:52b6::/64 scope global valid_lft forever preferred_lft forever inet6 fe80::5054:9cff:fe31:f1e0/64 scope link valid_lft forever preferred_lft forever root@netcup:~# /sbin/route -6 Kernel IPv6 routing table Destination Next Hop Flag Met Ref Use If ::1/128 :: U 256 0 0 lo 2a03:4000:6:52b6::/64 :: U 256 0 0 eth0 fe80::/64 :: U 256 0 0 eth0 ::/0 fe80::1 UGDAe 1024 3 0 eth0 ::/0 :: !n -1 1 163 lo ::1/128 :: Un 0 1 36 lo 2a03:4000:6:52b6::/128 :: Un 0 7 14 lo fe80::5054:9cff:fe31:f1e0/128 :: Un 0 1 5 lo ff00::/8 :: U 256 10 0 eth0 ::/0 :: !n -1 1 163 lo root@netcup:~# After some time (at least hours) the server is not reachable anymore on its IPv6 address, when connecting on the IPv4 address it seems that the gateway fe80::1 got lost: root@netcup:~# ip -6 addr show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000 inet6 2a03:4000:6:52b6::/64 scope global valid_lft forever preferred_lft forever inet6 fe80::5054:9cff:fe31:f1e0/64 scope link valid_lft forever preferred_lft forever root@netcup:~# /sbin/route -6 Kernel IPv6 routing table Destination Next Hop Flag Met Ref Use If ::1/128 :: U 256 0 0 lo 2a03:4000:6:52b6::/64 :: U 256 0 0 eth0 fe80::/64 :: U 256 0 0 eth0 ::/0 :: !n -1 1 3321 lo ::1/128 :: Un 0 1 270 lo 2a03:4000:6:52b6::/128 :: Un 0 2 670 lo fe80::5054:9cff:fe31:f1e0/128 :: Un 0 1 34 lo ff00::/8 :: U 256 12 0 eth0 ::/0 :: !n -1 1 3321 lo root@netcup:~# Rebooting restores the routing table and makes IPv6 working again. Has anybody an idea what is going wrong here? Any hint is welcome. Thanks Rainer -- Rainer Dorsch http://bokomoko.de/
