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Subnet configuration on a Hetzner dedicated root server (EX40) is a bit tricky than a normal additional single ip addresses that you can buy for 1EUR. So I wrote the configuration down:
You will need bridge-utils:
1 | apt-get install bridge-utils |
So I ordered a /28 subnet for my VM-landscape:
78.89.34.208/28 (255.255.255.240)
Usable IP-Addresses: 78.89.34.209 – 78.89.34.222
My root server had already: 56.23.67.56/27 (255.255.255.224)
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Host-System
Copy of /etc/network/interfaces
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 | # Loopback device auto lo iface lo inet loopback auto eth0 # IPv4 iface eth0 inet static address 56.23.67.56 netmask 255.255.255.224 gateway 56.23.67.33 pointopoint 56.23.67.33 auto system17 iface system17 inet static address 172.30.79.1 netmask 255.255.255.0 pre-up brctl addbr $IFACE post-up route add -host 78.89.34.209 $IFACE post-down brctl delbr $IFACE auto system18 iface system18 inet static address 172.30.80.1 netmask 255.255.255.0 pre-up brctl addbr $IFACE post-up route add -host 78.89.34.210 $IFACE post-down brctl delbr $IFACE |
From VM-System
Copy of /etc/network/interfaces
1 2 3 4 5 6 7 8 9 10 11 | # The loopback network interface auto lo iface lo inet loopback # The primary network interface allow-hotplug eth0 iface eth0 inet static address 78.89.34.209 netmask 255.255.255.255 gateway 56.23.67.56 pointopoint 56.23.67.56 |
So, you need to create for each new VM a new bridge.