Gateway disappears on IPv6
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/
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