On 11/27/06, Jeff Dike <[EMAIL PROTECTED]> wrote:
> On Mon, Nov 27, 2006 at 05:25:47PM +0200, Samuel Korpi wrote:
> > UM1: ubd0=cow1,/home/samuel/src/uml/uml-fedora/FedoraCore5-AMD64-root_fs
> > eth0=tuntap,tap0 eth1=mcast mem=256M umid=um1 con1=tty:/dev/tty
> >
> > UM2: ubd0=cow2,/home/samuel/src/uml/uml-fedora/FedoraCore5-AMD64-root_fs
> > eth0=mcast mem=256M umid=um2 con1=tty:/dev/tty6
> >
>
> Why eth0 on one and eth1 on the other?
>
No particular reason. But as you can see, I configured eth0 on UM1
with tuntap, so it would provide a gateway to host and to outside
network. I could have just as well but eth0=mcast for both (and
eth1=tuntap,tap0 for UM1), but I didn't think that would make a
difference.

> >
> > Then I tried pinging one from the other, but nothing. What could be
> > the problem? Guest kernel is 2.6.18.  'dmesg' shows nothing which
> > could explain this, the mcast device should be configured ok AFAIK:
> >
> > Could something on the host affect how mcast works?
>
> It could, but there would be errors in dmesg and from ifconfig.  I take it
> the ifconfigs succeeded, and there's nothing new in dmesg?
>
Yep, that's right. Furthermore, both tuntap and daemon networking work
just fine. And for my purposes those probably are sufficient. I was
just pretty surprised that multicast didn't work, as I couldn't find
anything wrong with my setup.

/Samuel

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