Libguestfs - Jan 2014 - Re: [PATCH] appliance: Disable ipv6 in the appliance because qemu usernet is ipv4 only

On Fri, Jan 24, Richard W.M. Jones wrote:
> However I don't understand why disabling IPv6 should be necessary.  If
> sites resolve to AAAA+A records, then presumably it's going to choose
> the A (IPv4) route since no IPv6 route exists.  If a site resolves to
> only an AAAA record, then it's not reachable whatever we do.
For me the code tries to reach the ipv6 address, which wont work.

Olaf

On Fri, Jan 24, 2014 at 11:55:26AM +0100, Olaf Hering
wrote:
> On Fri, Jan 24, Richard W.M. Jones wrote:
> 
> > However I don't understand why disabling IPv6 should be necessary.
If
> > sites resolve to AAAA+A records, then presumably it's going to
choose
> > the A (IPv4) route since no IPv6 route exists.  If a site resolves to
> > only an AAAA record, then it's not reachable whatever we do.
> 
> For me the code tries to reach the ipv6 address, which wont work.
Do you have a demonstration of this?

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
virt-p2v converts physical machines to virtual machines.  Boot with a
live CD or over the network (PXE) and turn machines into KVM guests.
http://libguestfs.org/virt-v2v

On Fri, Jan 24, Richard W.M. Jones wrote:
> On Fri, Jan 24, 2014 at 11:55:26AM +0100, Olaf Hering wrote:
> > On Fri, Jan 24, Richard W.M. Jones wrote:
> > 
> > > However I don't understand why disabling IPv6 should be
necessary.  If
> > > sites resolve to AAAA+A records, then presumably it's going
to choose
> > > the A (IPv4) route since no IPv6 route exists.  If a site
resolves to
> > > only an AAAA record, then it's not reachable whatever we do.
> > 
> > For me the code tries to reach the ipv6 address, which wont work.
> 
> Do you have a demonstration of this?
It seems mount defaults to nfsvers=4, which tries first ipv4 then ipv6. 

See log files.

Olaf