[Bug 1101187] [NEW] in case ow two networks on the same bridge nova overwrites dnsmasq config

Bolke de Bruin bolke.de.bruin at ing.nl
Fri Jan 18 13:05:44 UTC 2013

Public bug reported:

Some background: I run a private cloud environment (folsom/stable,
FlatDhcp) in the 172.17.11.XXX/24 range. The private range for instances
is 192.168.100.XX/24 . Basically if I add a floating IP it get's
assigned from the 172.17.11.XX/24 range. Recently, I needed to assign
172.17.11.XX fixed addresses for local usage.

nova-manage network list

1        None           None            None          
3        None           None            None 

This should happen on the same bridge (br100).

Now when activating an instance with a fixed ip, /var/lib/nova/networks
/nova-br100.conf gets overwitten. So I end up with only the
172.17.11.XXX fixed ip in that list. While i would expect 192.168
addresses and 172.17.11 addresses. It seems that nova is not able to
handle multiple ipranges/dnsmasq on one bridge?

As a workaround I activated the network on a new bridge. I needed to
activate proxy_arp and change some iptables to make sure traffic gets to
the instance. Not something really maintainable :).

** Affects: nova (Ubuntu)
     Importance: Undecided
         Status: New

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  in case ow two networks on the same bridge nova overwrites dnsmasq

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