Xen users - Sep 2007 - how to use eth2 instead of eth0 for bridge

I have a machine that I added a 1GB card to it, and it has onboard
eth0/1.  What''s the easiest way to tweak Xen to use eth2 for all
bridging instead of eth0?

Would I just override the line in the vif-common.sh where it says -eth0?

-Gary

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> 
> I have a machine that I added a 1GB card to it, and it has onboard
> eth0/1.  What''s the easiest way to tweak Xen to use eth2 for all
> bridging instead of eth0?
> 
> Would I just override the line in the vif-common.sh where it says -
> eth0?
> 
It looks like it''s automatically derived from the interface that holds
the default gateway, so I guess that it''s a mood point to change
anything.  It should work automatically.

Can someone confirm this?

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> I have a machine that I added a 1GB card to it, and it has 
> onboard eth0/1.  What''s the easiest way to tweak Xen to use 
> eth2 for all bridging instead of eth0?
> 
> Would I just override the line in the vif-common.sh where it 
> says -eth0?
> 
> -Gary
Just change your xend-config.sxp like this:

(network-script ''network-bridge netdev=eth2'') 


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Thanks.  I''ll try it.
-Gary
> -----Original Message-----
> From: xen-users-bounces@lists.xensource.com [mailto:xen-users-
> bounces@lists.xensource.com] On Behalf Of Fischer, Anna
> Sent: Sunday, September 16, 2007 11:06 PM
> To: Gary W. Smith
> Cc: xen-users@lists.xensource.com
> Subject: RE: [Xen-users] how to use eth2 instead of eth0 for bridge
> 
> > I have a machine that I added a 1GB card to it, and it has
> > onboard eth0/1.  What''s the easiest way to tweak Xen to use
> > eth2 for all bridging instead of eth0?
> >
> > Would I just override the line in the vif-common.sh where it
> > says -eth0?
> >
> > -Gary
> 
> Just change your xend-config.sxp like this:
> 
> (network-script ''network-bridge netdev=eth2'')
> 
> 
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> Xen-users mailing list
> Xen-users@lists.xensource.com
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Hi,

	But as far as I know even having 1GBit network card, the
communication of the guests (at least with HVM guests) will still ahve only
100 MBis, is it right? At least on Xen 3.1.0 this is so.. Does anybody know
if it is a different situation by the paravirtual hosts? Can be somehow
improved the network traffic for HVM hosts?

-----Original Message-----
From: xen-users-bounces@lists.xensource.com
[mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Gary W. Smith
Sent: Monday, September 17, 2007 8:46 AM
To: Fischer, Anna
Cc: xen-users@lists.xensource.com
Subject: RE: [Xen-users] how to use eth2 instead of eth0 for bridge

Thanks.  I''ll try it.
-Gary
> -----Original Message-----
> From: xen-users-bounces@lists.xensource.com [mailto:xen-users-
> bounces@lists.xensource.com] On Behalf Of Fischer, Anna
> Sent: Sunday, September 16, 2007 11:06 PM
> To: Gary W. Smith
> Cc: xen-users@lists.xensource.com
> Subject: RE: [Xen-users] how to use eth2 instead of eth0 for bridge
> 
> > I have a machine that I added a 1GB card to it, and it has
> > onboard eth0/1.  What''s the easiest way to tweak Xen to use
> > eth2 for all bridging instead of eth0?
> >
> > Would I just override the line in the vif-common.sh where it
> > says -eth0?
> >
> > -Gary
> 
> Just change your xend-config.sxp like this:
> 
> (network-script ''network-bridge netdev=eth2'')
> 
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
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On Mon, Sep 17, 2007 at 05:09:26PM +0200, Artur Linhart - Linux communication
wrote:
> 
> 	But as far as I know even having 1GBit network card, the
> communication of the guests (at least with HVM guests) will still ahve only
> 100 MBis, is it right? 
Nah, thats just what the model of the emulated network-card has as through-
put, you can do more with HVM as you can see from my small benching at
http://fluxcoil.net/doku.php/xen/docs .
> At least on Xen 3.1.0 this is so.. Does anybody know
> if it is a different situation by the paravirtual hosts? Can be somehow
> improved the network traffic for HVM hosts?
Use paravirtualized drivers if you can get those for the OS you are running
under HVM (my benchmark misses the case HVM/paradrivers thou, since para
is the most interesting method and HVM was just a fun here to look at).

Maybe someone has an explanation for the difference throughput
dom0->domU vs. domU->dom0 .


Christian

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On Sun, 2007-09-16 at 19:32 -0700, Gary W. Smith wrote:
> > 
> > I have a machine that I added a 1GB card to it, and it has onboard
> > eth0/1.  What''s the easiest way to tweak Xen to use eth2 for
all
> > bridging instead of eth0?
> > 
> > Would I just override the line in the vif-common.sh where it says -
> > eth0?
> > 
> 
> It looks like it''s automatically derived from the interface that
holds
> the default gateway, so I guess that it''s a mood point to change
> anything.  It should work automatically.
> 
> Can someone confirm this?
Usually most just add netdev=ethxx to the line in xend-config.sxp that
calls network-bridge.
>From the file (/etc/xen/scripts/network-bridge) :
# Usage:
#
# network-bridge (start|stop|status) {VAR=VAL}*
#
# Vars:
#
# vifnum     Virtual device number to use (default 0). Numbers >=8
#            require the netback driver to have nloopbacks set to a
#            higher value than its default of 8.
# bridge     The bridge to use (default xenbr${vifnum}).
# netdev     The interface to add to the bridge (default eth${vifnum}).
# antispoof  Whether to use iptables to prevent spoofing (default no).


I usually don''t use the scripts in /etc/xen/scripts, I let init handle
the bridging on boot, this is because I make a few dummy bridges to use
as ''virtual switches'' for my dom-U''s to enjoy a
private lan and
secondary nic.

My xend-config.sxp calls ''network-dummy'' , which is just a
script that
exits 0 and does nothing.

--Tim
> 
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