UDP clamped on service provider links

Fri Jul 31 12:07:30 UTC 2015

On Thu, 30 Jul 2015 21:18:10 -0500
Jason Baugher <jason at thebaughers.com> wrote:

> In one case, when we were having an issue with a SIP trunk, we
> re-numbered our end to another IP in the same subnet. Same path from
> A to Z, but the packet loss mysteriously disappeared using the new
> IP. It sure seems like they are throttling somewhere.

Not knowing how you evaluated the two paths, but if MPLS was not
considered, it may have perhaps been due in part to ECMP behavior.
While not ruling out UDP limits, it is plausible that the changed
source IP address resulted in a less congested path to be chosen.

John