On Friday 05 May 2006 18:02, Mattia Dongili wrote:
> On Fri, May 05, 2006 at 11:11:51AM +0200, Stephane Bortzmeyer wrote:
> > On Tue, May 02, 2006 at 08:39:54AM -0700,
> >  Brock, Anthony - NET <[EMAIL PROTECTED]> wrote
> >  a message of 25 lines which said:
>
> [...]
>
> > [42949384.150000] * bash -c echo 0 >
> > /proc/sys/net/ipv4/conf/tap0/proxy_arp [42949384.150000] * arp -i eth0 -d
> > 192.134.4.79 pub
> > [42949384.150000] * route add -host 192.134.4.79 dev tap0
> > [42949384.150000] * bash -c echo 1 >
> > /proc/sys/net/ipv4/conf/tap0/proxy_arp [42949384.150000] * arp -Ds
> > 192.134.4.79 eth0 pub
> >                                                                         
> > [ ok ] Most of these (modifying the routes, playing with the ARP cache,
> > enabling forwarding) require to be root and I do not think that access to
> > the TAP device is enough?
>
> Indeed, the last part of the trick is installing um-net suid root.
>
> # ls -l /usr/lib/uml/uml_net
> -rwsr-x--- 1 root uml-net 19648 2006-04-14 19:58 /usr/lib/uml/uml_net

Note that this binary, normally, resides in /usr/bin (in the future and on 
Debian it's in that position instead).

And that the _default_ installation of uml_utilities has uml_net installed as 
root.
-- 
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade
Chiacchiera con i tuoi amici in tempo reale! 
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