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[Xen-devel] Xen anti-spoof firewall issue with routing on a VM

  • To: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: Thomas Goirand <thomas@xxxxxxxxxx>
  • Date: Tue, 10 Jan 2012 02:59:47 +0800
  • Delivery-date: Mon, 09 Jan 2012 19:00:14 +0000
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  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>


On one of our server, we have a VM which does BGP routing, and routes a
full class C (let's pretend the network is I'm using Xen
4.0 from Debian Squeeze (unmodified package). We use, in

(network-script 'network-bridge antispoof=yes')

The issue is that the anti-spoof firewall of Xen prevents the networking
to work for other VMs which will use as gateway. If I do:

iptables -I INPUT -j ACCEPT
iptables -I FORWARD -j ACCEPT

of course, it does work, but that's not what I want. I really want to
have the anti-spoofing feature to be there. Also, if I add let's say to the xen startup file of the VM that does the BGP routing,
it doesn't work (eg:, which is used by another VM, is still
not routed).

What's the solution here?

Also, is there a plan for ipv6 support on this anti-spoof firewall?

If there's things to contribute so that the above can be done, I'd be
happy to work on that, so that anti-spoofing can be done.

Last, if I switch to xl instead of xm, is there a way to still have the
anti-spoof feature which is so nice?


Thomas Goirand

P.S: Has anyone tried the new XCP packages available in Debian SID since
Christmas? I've uploaded last week-end v1.3-15 in SID, after a long work
with Mike and Jon on it, and I believe it works quite well now, but
feed-back would be appreciated! Please see the QA page:


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