New router feature - icmp error source-interface [was: icmp rpf]

Joseph S D Yao jsdy at
Tue Sep 26 02:12:37 UTC 2006

On Mon, Sep 25, 2006 at 09:22:34AM -0400, Patrick W. Gilmore wrote:
> Who thinks it would be a "good idea" to have a knob such that ICMP  
> error messages are always source from a certain IP address on a router?

I've sometimes thought it would be useful when I wanted to hide a route.
But security via obscurity just makes it that much harder to fix
something.  Many more times than this would have been useful, I've been
able to identify at which router a problem was by a 'traceroute' that
told me into which router by which interface I was going.  When the
owner of the router might not even have known.  Or I have had attempts
to do this foiled by routers that used an internal loopback IP address.
On the whole, then, I guess I would vote, "no".

Joe Yao
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