Re: [LARTC] Unnumbered

["M.F. PSIkappa" <psi@platon.atlantis.sk>]

On Fri, 22 Jun 2001, Arthur van Leeuwen wrote:

> > > > it's posibility to make something similar to Cisco unnumber on Linux ?
> > > > E. g.
> > > > interface Serial0
> > > >  ip unnumbered Ethernet0
> > > > I don't want to assign to interface private IP.
> > >
> > > If I understand the ip unnumbered command correctly it allows you to share a
> > > single IP address on multiple interfaces. This is trivial on Linux: just add
> > > the same IP address to each of the interfaces with  ip addr add
> > >
> > > The routing effects I cannot correctly comment on, as I'm not sufficiently
> > > versed in IOS to fully grasp the effects of  ip unnumbered
> >
> > No, it's incorrect, unnumberd allow you to connect 2 router without IP
> > adresses.
> >
> > 192.168.0.1/24 [cisco]unnumbered-----unnumberd[cisco] 192.168.2.1/24
> >
> > It's special case of point-to-point connection. In linux if I make
> > point-to-point connection I have to assign any IP on both endpoint of
> > connection.
> 
> What is the difference with
> 
> 192.168.0.1/24 [linux] 192.168.0.1 ------- 192.168.2.1 [linux] 192.168.2.1/24
> 
> if I may be so bold to ask? Yes, the routing effects may be different, and I
> mentioned that might be a problem, but the unnumbered thing looks like a
> cisco-specific hack...

Difference is in traceroute. Unnumbered is invisible, if I assign IP I see
it in traceroute, but I can make hack that make this connection invisible,
but it's rfc break ...

Yes, it's cisco specific hack.
 
> Doei, Arthur.

PSIkappa
psi@atlantis.sk


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