On 2007年4月19日, Maik Brauer wrote:

Hello,
I've installed XEN3.0.4-1 and problems with the IPtables settings.

[snip]
Here is my reply from another (dead) thread with a similar problem:
---------- Forwarded message ----------
Date: Mon, 2 Apr 2007 01:40:10 +0200 (CEST)
From: Tomas Lund <tlund@xxxxxx>
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] iptables in dom0 with bridge: no more outbound 
connections
On 2006年12月30日, Peter Fokkinga wrote:

Quoting Jerry Amundson <jamundso@xxxxxxxxx>:

Peter Fokkinga wrote:

[iptables drops outgoing traffic when xend is running]
I get the feeling iptables does not remember its state, so my rule
 iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
has no effect. Kernel modules xt_state and ip_conntrack are loaded.

Depends on your distro. Redhat for example,
"service iptables save" (overwriting /etc/sysconfig/iptables).

I did not mean "remember" in the sense of "between reboots", but more like
that iptables does not register the outgoing packet. So when the first
"response" packet comes back and enters the INPUT rule it is seen as a NEW
packet instead of ESTABLISHED or RELATED and therefore dropped.

I can confirm the problem Peter is describing.

Sample commands to reproduce the problem:
iptables -F
iptables -A INPUT -m state --state ESTABLISHED -j ACCEPT
iptables -A INPUT -j DROP
telnet [host] [port]
//tlund
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