Re: [NANOG] Comcast latency

[James Michael Keller <jmkeller () houseofzen org>]

Tim Thompson wrote:
> On Tue, 29 Apr 2008 23:43:46 -0500 mack <mack () exchange alphared com> wrote:
>   
> > Has anyone else noticed a significant increase in latency within
> > Comcast's network?
> >     
>
> 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.
>
> -Tim Thompson
>   
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.

-- 
James Michael Keller


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