From owner-freebsd-net  Tue Jul 20  1:18:37 1999
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Date: Tue, 20 Jul 1999 10:10:57 +0200
From: Wim Livens <livensw@rc.bel.alcatel.be>
To: Wes Peters <wes@softweyr.com>, freebsd-hackers@freebsd.org,
	freebsd-net@freebsd.org
Subject: Re: bug in ip_forward() ?
Message-ID: <19990720101057.D1676@rc.bel.alcatel.be>
References: <19990719172546.C1676@rc.bel.alcatel.be> <37937846.55C1867E@softweyr.com>
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In-Reply-To: <37937846.55C1867E@softweyr.com>; from Wes Peters on Mon, Jul 19, 1999 at 01:11:02PM -0600
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On Mon, Jul 19, 1999 at 01:11:02PM -0600, Wes Peters wrote:

> > +------+         +------+         +------+         +------+
> > |      |4.2   4.1|      |2.1   2.2|      |5.1   5.2|      |
> > |btm22t|---------|btm22q|---------|btm22r|---------|btm22u|
> > |      |         |      |         |      |         |      |
> > +------+         +------+         +------+         +------+
> > 
> > And this is what I do:
> > 
> > btm22t# ping 192.168.5.2
> >  ok, it works...
> > btm22q# route delete -net 192.168.5.0 -netmask 255.255.255.252 192.168.2.2
> >  ok, ping stops.
> > btm22q# route add -net 192.168.5.0 -netmask 255.255.255.252 192.168.2.2
> >  ping doesn't work
> 
> And it shouldn't, you haven't given it an appropriate route.  From route(8):
> 
>      The other commands have the following syntax:
> 
>            route [-n] command [-net | -host] destination gateway
> 
>      where destination is the destination host or network, gateway is the
>      next-hop intermediary via which packets should be routed.
> 
> There's the important part right there: gateway is the *next-hop* intermediary
> via which packets should be routed.

Note that the ping is done from btm22t while the route is deleted/added
on btm22q.  (I've ommited the 192.168 prefix in the addresses in the
figure).

Now, I think I did specify a correct next-hop, namely 192.168.2.2, which
is a local destination for btm22q.

Thanks anyway, I should have been more clear.

Wim.



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