Re: [uml-devel] networking question

[Henrik N. <hn...@ma...>]

James Stevenson wrote:

> > If not using um_eth_serv, then root must create the tap devices that the
> > virtual machines connect to.
>
> yep thats not a problem
>
> > Give the user who runs uml read/write access to the device.
>
> chmod oug+rw /dev/tap0
> cat /dev/tap0 == EPERM in the open syscall

So the 2.2 kernel seems to be a bit more strict than the 2.4 kernel here
then...

Hmm. question: Have you configured the interface prior to attempting this?
  ifconfig tap0 inet ... up
it won't certainly not work if the interface is not there.

> > Hmm.. does it? None of mine copies of um_eth_serv know how to (thats why
> > I made um_eth_tap for this purpose)... but the new um_eth_tool know how
> > to instruct the driver to talk to TAP devices..
>
> where would i be able to find um_eth_tap ?

It is in the patch section on sourceforge. But it is currently somewhat 2.4
specific as it is written for the 2.4 TUN/TAP driver, not ETHERTAP. But
adopting it to ETHERTAP should be quite trivial.

> > > c) the network driver in uml dont seem to talk to
> > >    um_eth_serv properly
>
> i think it does but only for uml - uml networking

um_eth_serv does not care who connects to it. um_eth_serv only provides a
emulated ethernet (or actually any number of them), but is not connected
anywhere.

um_eth_tap is a daemon I wrote to connect a TAP device to um_eth_serv.

--
Henrik Nordstrom