Pkg xen devel - Jan 2019 - Bug#829499: src:xen: jessie xen domU in jessie dom0 sends ARP query for host behind router

Package: src:xen
Version: 4.4.1-9+deb8u5
Severity: normal

Dear Maintainer,
> * What led up to the situation?
Operated a domU with host-bridged network and a single static IP. The
dom0 interface is also a bridge, with one VLAN subinterface, one physical
interface and several vif interfaces for various other domU:s.

dom0 with standard jessie kernel 3.16.7-ckt25-2 and jessie userland.
domU with standard wheezy kernel 3.2.0-4-amd64 and jessie userland.

The domU was migrated to this dom0 from another dom0 with wheezy kernel and
userland, using the xm xen toolstack. The new jessie dom0 where the problem
was seen uses the xl xen toolstack.

The domU kernel was copied along with the domU disk image and *not* booted
using pygrub but specified in the xen .cfg file used to create the domU on
the new dom0.

> * What exactly did you do (or not do) that was effective (or ineffective)?
ping to a particular internet IP within the domU.

> * What was the outcome of this action?
An ARP request for the internet IP was seen by tcpdump running in dom0.

> * What outcome did you expect instead?
An ARP request for the default gateway IP seen by tcpdump running in dom0.



When trying to reproduce this problem by starting the domU on the problematic
dom0 host but connected to a new, different, bridge interface on the dom0,
unfortunately we have so far *not* been successful. Another difference
in the real life situation where that the dom0 was running 6 or 7 domUs.


-- 
cheers,
	Holger
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tags 829499 + moreinfo
thanks

Hi Holger,

I'm hunting down old bug reports in the Xen packages, trying to clean up
a bit, and also ran into this one.

Unfortunately noone ever replied to it. One of the reasons for that is
likely that the Xen team in Debian was not overly active around that time.

Since you also mention you couldn't reproduce the issue, I'm going to
copy paste my standard text here:

---- >8 ----

Your bug report was targeted at a Xen package in a Debian distribution
older than the current stable (Stretch).

Can you please help us by confirming that any of the following scenarios
does apply to your situation?

* I had this problem a long time ago. It was never solved, but I found a
workaround, which is ...
* I had this problem a long time ago, and I solved it by not using Xen
any more, but by doing ...
* I still experience this problem, and I'm still using Xen
3.2/4.1/4.4/etc. I cannot upgrade to Debian Stretch or Buster because ...
* I had this problem, and since upgrading to Stretch / Buster / ? it
seems it was solved, and I forgot to report it again. Please close it,
thanks.
* Other: ...

Note that even if you found a solution, it's still very useful to report
it back to our bug tracker. There might be someone else running into the
same problem, who can be helped with your information.

Please note that unless there's a response within a month from now, we
will close the bug report. If you discover this message later, and this
case is important to you, then you can try unarchiving the bug and
replying to it, or reach out to the maintainers email list at
pkg-xen-devel at lists.alioth.debian.org (no subscription required) and
post a message.

Thanks,
Hans van Kranenburg

Processing commands for control at bugs.debian.org:
> tags 829499 + moreinfo
Bug #829499 [src:xen] src:xen: jessie xen domU in jessie dom0 sends ARP query
for host behind router
Added tag(s) moreinfo.
> thanks
Stopping processing here.

Please contact me if you need assistance.
-- 
829499: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=829499
Debian Bug Tracking System
Contact owner at bugs.debian.org with problems

Your message dated Fri, 22 Feb 2019 19:05:54 +0100
with message-id <00722c1c-4326-a8c9-71d0-68f0a5e0d1dd at knorrie.org>
and subject line Re: src:xen: jessie xen domU in jessie dom0 sends ARP query for
host behind router
has caused the Debian Bug report #829499,
regarding src:xen: jessie xen domU in jessie dom0 sends ARP query for host
behind router
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner at bugs.debian.org
immediately.)


-- 
829499: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=829499
Debian Bug Tracking System
Contact owner at bugs.debian.org with problems
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From: Holger Levsen <holger at layer-acht.org>
Subject: src:xen: jessie xen domU in jessie dom0 sends ARP query for host behind
router
Date: Sun, 3 Jul 2016 23:15:27 +0200
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From: Hans van Kranenburg <hans at knorrie.org>
Subject: Re: src:xen: jessie xen domU in jessie dom0 sends ARP query for host
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Date: Fri, 22 Feb 2019 19:05:54 +0100
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