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

[David Rothera]

kk, just wanted to check :)

Sent from my iPad

On 12 Sep 2011, at 14:28, Persio Pucci wrote:

> David,
> 
> it's a POS OC12 SDH circuit we have, so unless the carrier is doing something funny SDH-wise, it's a sigle path... :/
> 
> On Mon, Sep 12, 2011 at 10:24 AM, David Rothera <david.rothera at gmail.com> wrote:
> 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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> 
>