[CentOS-virt] Writing iptables for inbound connections with libvirt

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Hi all,

  I have installed a CentOS 5.3 x86_64 server with kvm and libvirt to do 
some tests for future virtualized deployments.

My environment:

eth0 --> 172.25.50.1/24 ("public" host ip)
virbr0 ---> 192.168.122.1/24 (natted interface installed by libvirt)
virbr1 ---> 172.26.50.0/24 (internal virtualized network, whithout 
physical interface binded)

  Between 192.168.122.0/24 network and 172.26.50.0/24 network I have 
installed a virtual firewall. So to reach 172.26.50.0/24 network, all 
connections needs to come from 192.168.122.0/24 network.

  I need to insert some iptables rules to allow access to some services 
installed on 172.26.50.0/24 network like smtp,http,ftp, etc.

  How can I configure libvirt to forward and nat these services coming 
from 172.25.50.0/24 network to a specific IP under 192.168.122.0/24 
network?? Or do I need to use /etc/sysconfig/iptables configuration?? 
Some examples, please??.

  Many thanks.

-- 
CL Martinez
carlopmart {at} gmail {d0t} com
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