[libvirt] network route collision only checked IPv4 addr

[Daniel P. Berrange]

On Tue, Nov 15, 2011 at 05:20:40PM +0800, Jenna Johnson wrote:
> folks,
>      Noticed that in function "networkStartNetworkVirtual" only have IPv4
> addr checked in "networkCheckRouteCollision",will it be a problem that we
> don't check IPv6 addr?

We primarily put the check in there because we have a hardcoded IPv4
address in the default network, and this causes pain when you run
libvirt inside a guest. Since we have no default IPv6 address, we
don't need to worry about that usecase.

That all said, this check also prevents admin mis-configurations which
can mess up their host networking, and this is still relevant for IPv6.
So yes, we should make our collision check work for IPv6 too, but it is
not a critical problem like IPv4 was.

Daniel
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