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I'm building a linux virtualization node based on CentOS 6.3 with kvm and libvirt (using virsh as interface). I have a cheapass server at OVH with two public ipv4 addresses, i want to use the second address as primair address for a NAT network. The first virtual server (vm1) should be the gateway which communicates with the outside world.
So i bridged eth0 and assigned the bridge to the virtual machine's config. I expect that i can assign a public address to the virtual machine. However if i put the secundair ip to the virtual machine's network config with the correct gateway, broadcast and netmask i can still not communicate from outside.
# brctl show bridge name bridge id STP enabled interfaces
br0 8000.002590040544 yes eth0
tcpdump while pinging secundairy ip from outside: tcpdump -i br0 icmp -n
listening on br0, link-type EN10MB (Ethernet), capture size 65535 bytes
18:48:18.670758 IP **.210.**.25 > 94.**.***.169: ICMP echo request, id 5607, seq 17, length 64
proxy ip is turned on to avoid problems with different MAC's:
sysctl.conf: # proxy arp
net.ipv4.conf.eth0.proxy_arp = 1
net.ipv4.conf.br0.proxy_arp = 1
#bypass iptables for bridging
net.bridge.bridge-nf-call-iptables = 0
net.bridge.bridge-nf-call-arptables = 0