[nsp] RPF problem with ICMP unreachables

[Hank Nussbacher]

On Sun, 24 Nov 2002, Gert Doering wrote:

> Hi,
> 
> On Sun, Nov 24, 2002 at 03:55:46PM +0200, Hank Nussbacher wrote:
> > How does one force a router to not use *highest* IP address to return ICMP
> > unreachables and instead use the interface from where the ICMP came?
> 
> I've observed differences inCisco and Juniper here if routing is
> asymmetric.
> 
> Cisco seems to reliably reply with the address of the interface that the
> original came in.
> 
> Juniper uses the IP address of the *outgoing* interface as the source
> address of the ICMP packet.

I would be happy with either approach :-)

> 
> Bothapproaches are "correct", I personally find Cisco's more useful
> (because the output from Juniper is highly confusing on traceroute'ing
> through asymmetrically routed networks).
> 
> None of this can explain *your* problem, though, as both types should
> use the interface pointing towards your router...

I know. :-(

-Hank

> 
> gert
> 
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> Gert Doering - Munich, Germany                           gert@greenie.muc.de
> fax: +49-89-35655025                      gert.doering@physik.tu-muenchen.de
>