[162821] in North American Network Operators' Group
Re: Could not send email to office 365
daemon@ATHENA.MIT.EDU (Joe Abley)
Thu May 2 07:53:32 2013
From: Joe Abley <jabley@hopcount.ca>
In-Reply-To: <51820ABE.4070000@isc.org>
Date: Thu, 2 May 2013 07:53:15 -0400
To: Cathy Almond <cathya@isc.org>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 2013-05-02, at 02:42, Cathy Almond <cathya@isc.org> wrote:
> This may be a red herring, but I've heard of some dropping of DNS
> queries for the names within outlook.com domains where the queries are
> all coming from source port 53 (i.e. your recursive server doesn't use
> query source port randomization
... or there's a NAT or some other box in front of the recursive server =
which re-writes the source port...
> ). Might be worth checking what the
> recursive server you're using is doing?
>=20
> See https://www.dns-oarc.net/oarc/services/porttest
Joe=
