RE: [Xen-users] iptables problem

["Dustin Henning" <Dustin.Henning@xxxxxxxxxxx>]

Depending on your security needs, and the constraints of your kernel, a 
simpler, potentially less resource-intensive solution might be adding this line 
to the iptables configuration:

-A FORWARD -m physdev  --physdev-is-bridged -j ACCEPT

I use this setup, but I manage all of the domUs on that machine, so they don't 
need restricted at the bridge level.

Dustin

From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Sergey Smirnov
Sent: Wednesday, October 14, 2009 11:37
To: Ivan Lisenkov
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] iptables problem

Hi Ivan,

maybe you should add the permanent rules in the bottom of your iptables 
configuration like this? -

-A FORWARD --source domU_ip --jump ACCEPT
-A FORWARD --destination domU_ip --jump ACCEPT

so it will be works in any time without additional rules added by xen scripts.
I use the same configuration.

On Tue, Oct 13, 2009 at 2:31 PM, Ivan Lisenkov <ivan@xxxxxxxxx> wrote:
Dear xen users,

I am using xen 3.3.1 on opensuse 11.1. After creating a domU with 2 nics two 
iptables rules are created by default:

-A FORWARD -s XX.XX.XX.24/32 -m physdev  --physdev-in vif77.0 -j ACCEPT
-A FORWARD -p udp -m physdev  --physdev-in vif77.0 -m udp --sport 68 --dport 67 
-j ACCEPT
-A FORWARD -s XX.XX.XX.25/32 -m physdev  --physdev-in vif77.1 -j ACCEPT
-A FORWARD -p udp -m physdev  --physdev-in vif77.1 -m udp --sport 68 --dport 67 
-j ACCEPT

The rules seems logical, but one of them does no work! I can't ping XX.XX.XX.24 
from outside. But if I change the rule manulally to:

-A FORWARD -s 188.40.226.24/32 -m physdev  --physdev-in vif77.1 -j ACCEPT

everything works. This seems unlogical, because first ip is bounded to second 
nic, but works. The problem is that I have to change the rules every I reboot 
domu. 

Any ideas how to fix it?


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-- 
Serg Smirnov
email/xmpp: Sergey.A.Smirnov@xxxxxxxxx



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