[c-nsp] Troubleshoot UDP out-of-sequence

[David Rothera]

How are you certain that there are no load balanced paths along the way?

Even if there are none shown in your traceroutes there may still be routes in your providers network that are doing this (MPLS with propogate-ttl disabled) that would mean you wouldn't see it happening.

Just my 2 cents...


On 12 Sep 2011, at 12:38, Persio Pucci wrote:

> Hi folks,
> 
> I am having some problems trying to figure out what could be causing UDP
> packets get out-of-sequence on some multicast streams (market data) between
> Sao Paulo and New York.
> 
> There is no part of this path with parallel, load-balanced connections,
> which could be a obvious cause. What else could I check? The packets do
> arrive, so they are not being dropped on the way, but they arrive out of
> sequence, being useless to the application.
> 
> Also, we are monitoring on both ends sniffed data so I know I receive them
> in order in Sao Paulo, but not in New York. This is affecting a really small
> percentage of the data (less than 0,001%), but I believe this should be 0,
> and so do my customers (with reason).
> 
> Any ideas or tips?
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