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

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Subject: RE: [Xen-devel] Is a gateway necessary for Xen networking? (c/s 15203)
From: "Krysan, Susan" <KRYSANS@xxxxxxxxxx>
Date: Tue, 7 Aug 2007 16:54:30 -0400
Cc: "Carb, Brian A" <Brian.Carb@xxxxxxxxxx>
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Thread-topic: [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?



Sue Krysan

Linux Systems Group

Unisys Corporation


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: 
        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



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