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Ive got a Dedicated Server with 2 Public IP Adresses and would like to route all eth0:1 traffic to a KVM Guest via iproute2 or even iptables. Outgoing Traffic should also be routed to eth0:1 - eth0 and eth0:1 are assigned in different Subnets.

Setup is/should be as following: eth0:1 <-> br1, gateway for tap1 <-> KVM Guest

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This seems way too complex. Just bridge the VM and set the IP address in the guest.

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it actually was surprisingly simple:

-A PREROUTING -d -j DNAT --to-destination
-A POSTROUTING -s -j SNAT --to-source

thanks anyway!

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Yeah, and now you have completely unnecessary NAT which is going to make your life more difficult later. :) – Michael Hampton Oct 21 '12 at 16:53

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