[104214] in North American Network Operators' Group
Re: [NANOG] Comcast latency
daemon@ATHENA.MIT.EDU (Tim Thompson)
Fri May 2 08:53:34 2008
Date: Fri, 02 May 2008 08:53:29 -0400
From: Tim Thompson <tbt@ycrdi.com>
To: nanog@nanog.org
Errors-To: nanog-bounces@nanog.org
> Tim Thompson wrote:
>> Here, in New England, I normally see 20% packet loss between Comcast
>> and Level3 in NewYork using MTR. It has been as high as 60% in the
>> past so this is an improvement.
>>
James Michael Keller wrote:
> Remember that a number of ISP's 'core' routers are going to have ICMP
> rate limits in place when one of their interfaces is the target. While
> you may see high packet loss across an ISP link, unless you are getting
> similar numbers from all hops past that point you aren't looking at real
> packet loss, since the transit packets are getting through fine. It's
> just the routers themselves that are ignoring requests or discarding
> responses in favor of pushing routed packets.
Yes, the routers after Level3's edge router don't show similar packet
loss, so this must be the edge router just de-prioritizing ICMP. Thank
you for pointing out my mistake.
-Tim
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