Re: Refusing Pings on Core Routers??? A new trend?

["Patrick W. Gilmore" <patrick () ianai net>]

On Oct 19, 2006, at 10:14 PM, Rubens Kuhl Jr. wrote:
> > template response -- I hear is "Well, you can't rely on traceroute
> > because of ICMP prioritisation".  When you start to explain how
> > traceroute actually works (both ICMP-based and UDP-based (which
> > still relies on ICMP responses, of course!)), and that ICMP prio
> > should only affect the IP of which the router listens on (and not
> > hops beyond or at the dest), most NOCs fire back with another
>
> If I recall well, Cisco GSRs impose low priority and/or limits for all
> ICMP traffic flowing thru the box, not just packets to/from router
> itself, and there's not a knob to adjust that.

You don't recall well.

Although there is a knob if you want to tweak it.  But there's a knob  
for just about everything - it's just not tweaked by default.

--
TTFN,
patrick