Mike Jagdis wrote:
> On Tue, 1 Jun 1999, Robert C. Paulsen, Jr. wrote:
>
> > > alias tap0 ethertap
> > > options tap0 -o tap0 unit=0
> >
> > Thanks. I figured most of this out already and it all seems to be
> > working, but I do not use the "options" line above. Do you know the
> > consequences of leaving this out?
>
> If you leave them out you can only have one ethertap interface.
> The -o <name> gives the loaded module <name> rather than the
> default of ethertap. This is necessary because you can only have
> one module with a given name loaded at once. The unit=<n> tells
> the ethertap code what interface to register - otherwise it
> always tries to register tap0. With the current ethertap code
> you can have 16 tap<n> interfaces but each interface requires
> a separate ethertap module to be loaded. Yes, someone should
> fix this sometime.
Right...finally the light dawns. Now I see - the module creates its own tap0
interface. Now I've removed that hand-entered /dev/tap0 I did, I no longer see
any diald errors like 'start tap0: SIOCADDRT: File exists' in the log. I'm
afraid I've encouraged others to do roll their own /dev/tap0 and enter this
options line too- a result of me reading almost enough documentation but not
quite enough.
Summary: there appears to be no need to have a /dev/tap0 file unless you want
other programs to access that interface for your own purposes, and there's no
need for an options line unless you have more than one dial-out line.
Mike, if you need to have a permanent /dev/tap0 is there any way to suppress
that error in diald?
> > I looked at /usr/src/linux/Documentation/networking/ethertap.txt and
> > /usr/src/linux/drivers/net/ethertap.c but couldn't find any reference to
> > those options. Is there more documentation somewhere?
>
> Only the definitive reference, i.e. the source. And now diald :-).
>
> Mike
>
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