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Re: [libvirt] [PATCH] network: bridge: Don't start network if it collides with host routing

On 05/20/2010 07:41 PM, Cole Robinson wrote:
Fedora bug https://bugzilla.redhat.com/show_bug.cgi?id=235961

If using the default virtual network, an easy way to lose guest network
connectivity is to install libvirt inside the VM. The autostarted
default network inside the guest collides with host virtual network
routing. This is a long standing issue that has caused users quite a
bit of pain and confusion.

On network startup, parse /proc/net/route

Any interest in doing this with netlink instead? (I've got this "thing" against parsing text files to get information if it can be retrieved via a nice clean API). If so, I think I can whip up the equivalent code with libnl calls, but probably not until later in the afternoon.

If I'm the only one who feels uneasy about parsing stuff out of /proc, then I'm fine with that too.

  and compare the requested
IP+netmask against host routing destinations: if any matches are found,
refuse to start the network.

Do we maybe want to check for any networks that would encompass existing host interface IP addresses, or existing route destination IPs?

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