nanog mailing list archives
Re: Refusing Pings on Core Routers??? A new trend?
From: "Patrick W. Gilmore" <patrick () ianai net>
Date: Thu, 19 Oct 2006 22:19:48 -0400
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 anotherIf 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
Current thread:
- Refusing Pings on Core Routers??? A new trend? Deepak Jain (Oct 19)
- Re: Refusing Pings on Core Routers??? A new trend? Jeremy Chadwick (Oct 19)
- Re: Refusing Pings on Core Routers??? A new trend? Rubens Kuhl Jr. (Oct 19)
- Re: Refusing Pings on Core Routers??? A new trend? Patrick W. Gilmore (Oct 19)
- Re: Refusing Pings on Core Routers??? A new trend? Eric Spaeth (Oct 19)
- Re: Refusing Pings on Core Routers??? A new trend? Mikael Abrahamsson (Oct 20)
- Re: Refusing Pings on Core Routers??? A new trend? Rubens Kuhl Jr. (Oct 19)
- RE: Refusing Pings on Core Routers??? A new trend? Schliesser, Benson (Oct 19)
- <Possible follow-ups>
- Re: Refusing Pings on Core Routers??? A new trend? Fergie (Oct 19)
- Re: Refusing Pings on Core Routers??? A new trend? Jeremy Chadwick (Oct 19)