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Huagang XIE

2011-Feb-09 22:34 UTC

[Xen-users] Xen with NAT networking.

Hello there,

I was trying to setup a XEN NAT. I think I follow all the instructions
but still failed.

In NAT environment,  the tap.x is the gateway for the guest os, right?
but the xen always set the
gateway to vif.x, and the guest os will never be able to communicate outside.

one trick I did is to add a "xenbr0" bridge, and all the tap.x
interfaces will automatically be part of this bridge, and I make
xenbr0 as the gateway,
and it seems works fine, but occasional, the network drops packets..

Does anyone here successfully configure a NAT networking with XEN? I
am using Xen 3.4.3 and also trying 4.0.1 under Centos 5.

Thanks for your help

Huagang

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Mark Pryor

2011-Feb-09 23:18 UTC

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Re: [Xen-users] Xen with NAT networking.

--- On Wed, 2/9/11, Huagang XIE <huagangxie@gmail.com> wrote:
> From: Huagang XIE <huagangxie@gmail.com>
> Subject: [Xen-users] Xen with NAT networking.
> To: xen-users@lists.xensource.com
> Date: Wednesday, February 9, 2011, 2:34 PM
> Hello there,
> 
> I was trying to setup a XEN NAT. I think I follow all the
> instructions
> but still failed.
> 
> In NAT environment,  the tap.x is the gateway for the
> guest os, right?
> but the xen always set the
> gateway to vif.x, and the guest os will never be able to
> communicate outside.
> 
Gateway is at 10.0.0.254
so set your guest with
network 10.0.0.0
netmask 255.255.255.0

address 10.0.0.5   <--- your choice

whatever address you choose on the above network, must be set in both ifcfg-eth0
and in your domU config

vif = [''ip=10.0.0.5,mac=00:16:3e:aa:bb:cc'']
> 
> Does anyone here successfully configure a NAT networking
> with XEN? I
> am using Xen 3.4.3 and also trying 4.0.1 under Centos 5.
> 
yes, but in addition to above comments add:

echo ''net.ipv4.ip_forward = 1'' >> /etc/sysctl.conf

-- 
Mark




      

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