RE: [Xen-devel] Is a gateway necessary for Xen networking? (c/s 15203)

["Szymanski, Lukasz K" <Lukasz.Szymanski@xxxxxxxxxx>]

The default gateway issue was initially reported in May 2006 http://lists.xensource.com/archives/html/xen-devel/2006-05/msg01485.html and fixed in c/s 10239 http://xenbits.xensource.com/xen-unstable.hg?diff/275955c6df9d/tools/examples/network-bridge.   Three months ago c/s 15203 removed all references to the variable vifnum and in the process reintroduced the default gateway issue.

 

This patch essentially replicates the one from c/s 10239, defaulting to eth0 if there is no default route specified.

 

Luke Szymanski
Linux Systems Group
Unisys Corp.

 

 

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From: Keir Fraser [mailto:Keir.Fraser@xxxxxxxxxxxx]
Sent: Wednesday, August 08, 2007 3:11 AM
To: Krysan, Susan; xen-devel@xxxxxxxxxxxxxxxxxxx
Cc: Carb, Brian A
Subject: Re: [Xen-devel] Is a gateway necessary for Xen networking? (c/s15203)

 

 

 

I think most people will have a default gateway, but we’d take a patch to remove that assumption from the scripts.

 

 -- Keir

 

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From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Krysan, Susan
Sent: Tuesday, August 07, 2007 4:55 PM
To: xen-devel@xxxxxxxxxxxxxxxxxxx
Cc: Carb, Brian A
Subject: RE: [Xen-devel] Is a gateway necessary for Xen networking? (c/s 15203)

Posting this again, hoping for a response.

 

c/s 15203 removed netloop from network bridge init scripts and assumes a default gateway route is defined.  When one is not defined, networking does not work.  Is it truly the intention of this c/s to require a gateway for xen, even though one is not required when we boot the linux kernel?

 

Thanks,

Sue Krysan

Linux Systems Group

Unisys Corporation

 

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From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Carb, Brian A
Sent: Monday, July 02, 2007 3:41 PM
To: xen-devel@xxxxxxxxxxxxxxxxxxx
Cc: Carb, Brian A
Subject: [Xen-devel] Is a gateway necessary for Xen networking?

 

Using Xen unstable (changeset 15445) on X86_64 SLES10, we are no longer able to start networking without a default gateway.

 

After "xend" starts,

-  ifconfig shows eth0, lo, and tmpbridge, and xen networking is incomplete

-  "brctl show" reveals tmpbridge with no interfaces connected

 If we modify the network-bridge script to show output: 
        #!/bin/bash         
        exec 2>/tmp/log 
        set -x
and restart xend, the log file shows that xen-network-common.sh fails in a call to getcfg:
        + preiftransfer
        ++ /sbin/getcfg -d /etc/sysconfig/network/ -f ifcfg- --
        Error in getcfg (get_config.c, 303):
        Give exactly one argument

If we create a default route, the script does not error and a peth0 is created.

Since a gateway is not required for linux, should it be required for Xen?

brian carb
unisys corporation - malvern, pa

 

 

Attachment: default_gateway.patch
Description: default_gateway.patch

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