Hetzner, Debian, KVM and IPv6

Mon, 25 Aug 2014 20:08:11 +0000

Well, I’ve had my share of troubles with Hetzner, Debian, KVM and IPv6 addresses. After figuring out how to get around the IPv6 neighbor stuff (npd6 for teh win!), I battled with the problem that after restarting (rebooting/resetting - doesn’t really matter) a domain it’s IPv6 address would no longer work.

Well, today I decided to take a closer look. After the reboot, the guest comes up with this:

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pinguinfuss:(thanatos.heimdaheim.de/webs) PWD:~
Mon Sep 09, 19:01:27 [0] > ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
 inet 127.0.0.1/8 scope host lo
 inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
 link/ether 52:54:00:96:ed:35 brd ff:ff:ff:ff:ff:ff
 inet 78.46.37.114 peer 78.46.37.118/32 brd 78.46.37.114 scope global eth0
 inet6 2a01:4f8:110:3148::5/64 scope global tentative dadfailed
 valid_lft forever preferred_lft forever
 inet6 fe80::5054:ff:fe96:ed35/64 scope link
 valid_lft forever preferred_lft forever

A quick peek into ip 6 neigh show reveals this:

Ipv6 on BAFM

Hetzner, Debian, KVM and IPv6