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maybe a bug, but where? (dnsmasq-dhcp versus Redis inside KVM)

To: "<openstack@xxxxxxxxxxxxxxxxxxx>" <openstack@xxxxxxxxxxxxxxxxxxx>
From: Christian Parpart <trapni@xxxxxxxxx>
Date: Mon, 18 Jun 2012 15:01:02 +0200

Hey all,

after having upgraded to dnsmasq 1.62 (current), increasing
the lease times up to 7 days, I now have a very silent syslog
on my gateway host. However, there is one KVM instance
(running redis inside, w/ a 16GB RAM flavor),
that still looses its IP very very frequently.

It now seems, that even after just 4 hours of KVM instance uptime,
the nova-network node receives the following and logs it with:

2260 Jun 15 16:51:37 cesar1 dnsmasq-dhcp[8707]: DHCPREQUEST(br100)
10.10.40.16 fa:16:3e:3d:ff:f3
2261 Jun 15 16:51:37 cesar1 dnsmasq-dhcp[8707]: DHCPACK(br100) 10.10.40.16
fa:16:3e:3d:ff:f3 redis-appdata1
[....]
3381 Jun 15 21:59:41 cesar1 dnsmasq-dhcp[10889]: DHCPREQUEST(br100)
10.10.40.16 fa:16:3e:3d:ff:f3
3382 Jun 15 21:59:41 cesar1 dnsmasq-dhcp[10889]: DHCPACK(br100) 10.10.40.16
fa:16:3e:3d:ff:f3 redis-appdata1
[....]

And 26:59 was exactly the time our redis server went down.
Although, I cannot find anything except cron logs in the KVM instance's
syslog.

My question now is, why is such a request causing network unreachability to
that node?

Many thanks in advance,
Christian Parpart.