ipv6 with KVM on debian

Posted by Eliasdx on Server Fault See other posts from Server Fault or by Eliasdx
Published on 2011-02-07T14:17:23Z Indexed on 2012/03/25 23:32 UTC
Read the original article Hit count: 240

Filed under:

networking

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debian

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kvm-virtualization

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IPv6

I have trouble setting up IPV6 on my Proxmox (KVM) server:

My ISP sent me this information(xxx=placeholder):

IPs: 2a01:XXX:XXX:301:: /64
Gateway: 2a01:XXX:XXX:300::1 /59

This is the interface setup on the host server:

auto vmbr1
iface vmbr1 inet static
    address  178.XX.XX.4
    broadcast 178.XX.XX.63
    netmask  255.255.255.192
    pointopoint 178.XX.XX.1
    gateway     178.XX.XX.1
    bridge_ports eth0
    bridge_stp off
    bridge_fd 0
iface vmbr1 inet6 static
    address 2a01:XXX:XXX:301::2
    netmask 64
    up ip -6 route add 2a01:XXX:XXX:300::1 dev vmbr1
    down ip -6 route del 2a01:XXX:XXX:300::1 dev vmbr1
    up ip -6 route add default via 2a01:XXX:XXX:300::1 dev vmbr1
    down ip -6 route del default via 2a01:XXX:XXX:300::1 dev vmbr1

On the guest:

auto eth0
iface eth0 inet static
    address 178.xx.xx.47
    netmask 255.255.255.255
    broadcast 178.xx.xx.63
    gateway 178.xx.xx.1
    pointopoint 178.xx.xx.1

iface eth0 inet6 static
    pre-up modprobe ipv6
    address 2a01:XXX:XXX:301::2:2
    netmask 64
        up ip -6 route add 2a01:XXX:XXX:300::1 dev eth0
        down ip -6 route del 2a01:XXX:XXX:300::1 dev eth0
        up ip -6 route add default via 2a01:XXX:XXX:300::1 dev eth0
        down ip -6 route del default via 2a01:XXX:XXX:300::1 dev eth0

Ipv4 works on both host and guest but Ipv6 only works "sometimes". It's up for minutes and then down again until I change something.

However I can actually ping the host and the guest from both host and guest.

host:~# ip -6 neigh
2a01:XXX:XXX:301::100:2 dev vmbr1 lladdr 00:50:56:00:00:e0 REACHABLE
2a01:XXX:XXX:300::1 dev vmbr1 lladdr 00:26:88:76:18:18 router STALE

host:~# ip -6 route
2a01:XXX:XXX:300::1 dev vmbr1  metric 1024  mtu 1500 advmss 1440 hoplimit 4294967295
2a01:XXX:XXX:301::/64 dev vmbr1  proto kernel  metric 256  mtu 1500 advmss 1440 hoplimit 4294967295
fe80::/64 dev vmbr0  proto kernel  metric 256  mtu 1500 advmss 1440 hoplimit 4294967295
fe80::/64 dev eth0  proto kernel  metric 256  mtu 1500 advmss 1440 hoplimit 4294967295
fe80::/64 dev vmbr1  proto kernel  metric 256  mtu 1500 advmss 1440 hoplimit 4294967295
fe80::/64 dev tap101i1d0  proto kernel  metric 256  mtu 1500 advmss 1440 hoplimit 4294967295
default via 2a01:XXX:XXX:300::1 dev vmbr1  metric 1024  mtu 1500 advmss 1440 hoplimit 4294967295

Does someone know why it isn't working? And is there a way to configure multiple v6 IPs from the same subnet so I can dedicate IPs to websites on a server with multiple virtualhosts?

Developer IT