Hetzner KVM guest networking

Mon, 17 Jun 2013 16:39:48 +0000

Now, since we’re using bridged routing, we need to adjust the guest.

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13


auto eth0
iface eth0 inet static
 address 78.46.37.114
 netmask 255.255.255.255
 pointopoint 78.46.37.118
 gateway 78.46.37.118
 post-up ping -c2 78.46.37.118 &>/dev/null

iface eth0 inet6 static
 address 2a01:4f8:110:3148::5
 netmask 64
 gateway 2a01:4f8:110:3148::2
 post-up ping6 -c2 2a01:4f8:110:3148::2 &>/dev/null

This’ll take care of the bridged routing and the ICMPv6 announcement to the host. Without the ping/ping6, guest and host won’t be able to communicate (no clue why).

Hetzner KVM host bridge configuration

Mon, 17 Jun 2013 16:37:41 +0000

Firstoff, adjust the /etc/network/interfaces file to look like this:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34


# device: eth0
auto eth0
iface eth0 inet static
 address 78.46.37.118
 netmask 255.255.255.255
 gateway 78.46.37.97
 pointopoint 78.46.37.97

iface eth0 inet6 static
 address 2a01:4f8:110:3148::2
 netmask 64
 gateway fe80::1

auto vmbr0
iface vmbr0 inet static
 address 78.46.37.118
 netmask 255.255.255.255
 bridge_ports none
 bridge_stp off
 bridge_fd 0
 post-up ip route add 78.46.37.108/32 dev vmbr0
 post-up ip route add 78.46.37.110/32 dev vmbr0
 post-up ip route add 78.46.37.114/32 dev vmbr0

iface vmbr0 inet6 static
 address 2a01:4f8:110:3148::2
 netmask 64
 post-up ip -6 neigh add proxy 2a01:4f8:110:3148::3 dev eth0
 post-up ip -6 neigh add proxy 2a01:4f8:110:3148::4 dev eth0
 post-up ip -6 neigh add proxy 2a01:4f8:110:3148::5 dev eth0
 post-up ip -6 neigh add proxy 2a01:4f8:110:3148::6 dev eth0
 post-up ip -6 neigh add proxy 2a01:4f8:110:3148::7 dev eth0
 post-up ip -6 neigh add proxy 2a01:4f8:110:3148::8 dev eth0
 post-up ip -6 neigh add proxy 2a01:4f8:110:3148::9 dev eth0

Secondly, adjust you KVM guest network config to look like this (similar, you might want to replace the MAC address of the guest):

Hetzner on BAFM

Hetzner KVM guest networking

Hetzner KVM host bridge configuration