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[Xen-users] Re: CentOS 5.2, xen-3.3, network/firewall setup

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Re: CentOS 5.2, xen-3.3, network/firewall setup
From: Robin Bowes <robin-lists@xxxxxxxxxxxxxx>
Date: Wed, 22 Oct 2008 16:56:41 +0100
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Meng Kuan wrote:

On Oct 22, 2008, at 8:17 PM, Robin Bowes wrote:
I have CentOS 5.2 Dom0, which was running xen-3.1.2 which I rebuilt from Fedora RPMS. All DomUs worked fine (CentOS PV installs).

I recently upgraded to xen-3.3 (from the gitco repo - nice job!) and I've found that guest networking is working the same. Specifically, the Dom0 firewall is blocking traffic to/from the DomUs.

If I turn off iptables on the dom0, the guest networking works OK.


Try the following tip from http://wiki.libvirt.org/page/Networking


Alternatively, you can prevent bridged traffic getting pushed through the host's iptables rules. In /etc/sysctl.conf add

# cat >> /etc/sysctl.conf <<EOF
net.bridge.bridge-nf-call-ip6tables = 0
net.bridge.bridge-nf-call-iptables = 0
net.bridge.bridge-nf-call-arptables = 0
EOF
# sysctl -p /etc/sysctl.conf

Thanks.

I'm doing a new install so I can see what the "out-of-the-box" settings are, and take it from there.

Cheers,

R.


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