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Re: [Xen-users] Cannot ping DomU from Dom0 / cannot ping same site from two DomUs at the same time

  • To: Xen User-List <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: "Fajar A. Nugraha" <fajar@xxxxxxxxx>
  • Date: Tue, 9 Jun 2009 16:04:34 +0700
  • Delivery-date: Tue, 09 Jun 2009 02:05:18 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>

On Tue, Jun 9, 2009 at 3:27 PM, Wolfgang Formann<wformann@xxxxxxxx> wrote:
> Now when I do a ping from Dom0 to DomU I see the following tcpdump:
> 09:45:43.191701 arp who-has tell
> and no answer within a few seconds.
> So it seems that something with arp is not fine. Any ideas what to do next?

Dump Suse?

Kidding :)
If it were ARP issue your domU would be completely disconnected from
network. Since you say you can ping other host from domU, that's
probably not it. I'd check domU's firewall first, most likely its
blocking things (including ICMP echo). Disable it first for
troubleshooting purposes.

> The other problem which may be related is a little bit more strange. I have 
> set
> up two DomU's, one with Vista-32bit and one with Vista-64bit. Both have
> differend IP-addresses and different MAC-addresses. I can ping whatever host 
> (in
> my LAN or in the internet) with both DomU's. No problem. I can also ping any
> host, even on a different subnet in my LAN from both DomU's at the same time.
> But when I try to ping www.suse.com (or any other host in the internet) at the
> same time only that DomU pings successfully where I started the ping first, 
> the
> other DomU fails. If one DomU pings www.slashdot.org an other other pings
> www.suse.com both pings work fine. Ping also works fine, when I ping any other
> host in my LAN from both DomU's. This one puzzles mee too. I crosschecked and
> can ping from any other pair of my machines to the outside without problems.

At this point I suggest check your networking setup. Perhaps your
router/firewall to the internet is doing something funny?


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