[CentOS-virt] routing problem with domU bridged to two networks
peter.peltonen at gmail.com
Wed Mar 7 13:41:05 EST 2012
As I received no response on the general CentOS list, I'll repost it
here as the question is about Xen virtual machine routing.
This is my network setup:
Lets assume my dom0's eth2 public ip is 18.104.22.168 and my dmz network
22.214.171.124/255.255.255.224 . I have created NAT from my LAN with
iptables. You can see my /etc/sysconfig/iptables here:
And this is my dom0 routing table:
To access NFS shares on a (non-virtualized) file server in the LAN
network from the domU web server in the DMZ network.
What I tried:
I attached the domU to both bridges using this Xen config:
vif = [ "mac=00:0c:29:de:3a:fe,bridge=xenbr0","mac=00:0C:29:76:19:85,bridge=xenbr1"
and then created two eth interfaces inside the domU mapping to the MAC
addresses above, giving eth1 an IP from the DMZ (126.96.36.199) and
giving eth2 an IP from the LAN (192.168.0.12). After this I mounted
the NFS share from the file server (192.168.0.2).
If my domU web server is connected to both LAN and DMZ using the two
bridges xenbr0 and xenbr1, I can access the NFS share from the domU
web server and everything else works as expected, except for one thing
-- my workstations in the LAN cannot anymore access the web server:
web pages do not open anymore and from the workstations I cannot ping
the domU. If the web server domU is only connected to DMZ via xenbr0,
the workstations can access it ok.
Any advice what I am doing wrong and I could fix my setup?
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