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[Xen-users] Xen networking problems

  • To: xen-users@xxxxxxxxxxxxxxxxxxx
  • From: Fred Blaise <chapeaurouge@xxxxxxxxx>
  • Date: Thu, 2 Feb 2006 16:17:19 +0100
  • Delivery-date: Thu, 02 Feb 2006 15:27:35 +0000
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  • List-id: Xen user discussion <xen-users.lists.xensource.com>

Hi list

I am having several networking issues with Xen 3.0 STABLE. Running on
Debian, both dom0 and domUs.

First one is about the vifs. If we specify the vif for a domU, then IP
communication shuts down between the dom0 and the domUs (and
vice-versa), and between the domU's and the external world. However,
dom0 with external world continues to work. Is it a well known issue?

Second problem is the topology change. Whenever we unplug a cable
along the path of the Xen connection, it detects the change, and
disables its network. This is fine, I guess. However, the problem
comes when you plug the cable back and network communication comes
back up, it takes about 2mn to Xen to detect the topology change and
to regain connectivity to the server. Is there a way to decrease the
time it takes?

Also, I seem to have arp issues. Sometime, a domU will forget a MAC
from another domU, until a ping request is made for example, and the
arp tables updated. Until some low-level "wake-up" such as ping is
made, the network communication is down between the 2 domUs... Very
odd indeed. I am unfortunately no network expert, so my words may not
be adequate. In my case, an LDAP request needs to be made. I
tcpdump'ed on both sides, and the request is not going on the wire..
looked at the arp table then, and the other server's MAC was not
there, until I ping manually. I then retried the LDAP request, and it
worked then.

If someone would be kind enough to try to help me understand, and
point in the right direction. The system it's running on is a pilot
system. If all goes well, this should go into production soon. This is
why the 3.0.0 stable version is used. Note that since 3.0.1 is out
now, it may become stable enough by then...

Thank you.

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