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

[Persio Pucci]

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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>