[Xen-users] networking issues

["C.J. Adams-Collier" <cjcollier@xxxxxxxxx>]

Hey all,

I've got a box with networking issues.

The
machine is on a bridge with all of the other domU VMs.  In most cases,
it can ping others on the bridge at a reasonable speed.  However,
sometimes we get something like this:

<pre>
$ ping colliertech.com
PING 
colliertech.com (66.152.65.3) 56(84) bytes of data.
64 bytes from 
66.152.65.3: icmp_seq=1 ttl=64 time=0.735 ms
64 bytes from 
66.152.65.3: icmp_seq=2 ttl=64 time=0.694 ms
64 bytes from 66.152.65.3
: icmp_seq=3 ttl=64 time=0.736 ms

--- colliertech.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 15578ms
rtt min/avg/max/mdev = 0.694/0.721/0.736/0.036 ms
</pre>


see how the ping times are reasonable, but
the total time is 15 seconds?  There is a 5 second-ish delay between
send and receive of those packets even though they are reporting a rtt
of .7ms

Worse, I can't even ping anything that's not on the bridge.  the router is 66.152.65.1, and this box receives no results from pinging that one.

<pre>
$ ping 
66.152.65.1
PING 66.152.65.1 (
66.152.65.1) 56(84) bytes of data.

--- 66.152.65.1 ping statistics ---
6 packets transmitted, 0 received, 100% packet loss, time 5006ms
</pre>

tcpdump tells me that ping requests make it at least as far as the dom0:

<pre>
cjcollier@debian1:~$ sudo tcpdump -i xenbr0 'icmp[icmptype] = icmp-echo or icmp[icmptype] = icmp-echoreply'
tcpdump: WARNING: xenbr0: no IPv4 address assigned
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on xenbr0, link-type EN10MB (Ethernet), capture size 96 bytes
14:37:39.742670

 IP host-66-152-65-9.vdomainhosting.net > 
py-in-f99.google.com: icmp 64: echo request seq 25
14:37:40.742808 IP 
host-66-152-65-9.vdomainhosting.net > py-in-f99.google.com: icmp 64: echo request seq 26
14:37:41.742929
 IP host-66-152-65-9.vdomainhosting.net
 > py-in-f99.google.com: icmp 64: echo request seq 27
14:37:42.743074 IP 
host-66-152-65-9.vdomainhosting.net > 
py-in-f99.google.com: icmp 64: echo request seq 28
14:37:43.743224 IP 
host-66-152-65-9.vdomainhosting.net > 
py-in-f99.google.com: icmp 64: echo request seq 29
14:37:44.743414 IP host-66-152-65-9.vdomainhosting.net
 > py-in-f99.google.com
: icmp 64: echo request seq 30
</pre>

help? :)
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