Public bug reported:
Binary package hint: kvm
Lenovo Thinkpad T61p
Intel(R) Core(TM)2 Duo CPU T8300 @ 2.40GHz
2.5G RAM
Ubuntu Hardy w/ all updates
Guest machines were created using virt-manager (0.5.3-0ubuntu10). Four
networks defined 2x public (NAT to any physical interface), 2x private.
Three guests created running fully updated Ubuntu Hardy. On all guests
the order of the networks assigned to the virtual NICs was the same.
First the two public networks on eth0 and eth1, followed by the private
networks on eth2 and eth3. On each machine the first three interfaces
(eth0, eth1, and eth2) worked flawlessly with ping responses between
virtual machines of sub 2ms. However, on each machine pings to the
private network connected to eth3 failed, unless targeted to the local
machines IP address. Adding virtio to the network definition improved
things somewhat as responses were now received. However, the response
time for this network was extraordinarily high with an average of
1000+ms.
I've tested various combinations of the networks present. In all cases,
if the number of networks is reduced to three or less everything works
fine.
Please let me know if I can provide any further information.
** Affects: kvm (Ubuntu)
Importance: Undecided
Status: New
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4th network extremely slow/broken
https://bugs.launchpad.net/bugs/288379
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