[173437] in North American Network Operators' Group
Re: TCP Window Scaling issue
daemon@ATHENA.MIT.EDU (Zach Hill)
Thu Jul 24 12:32:15 2014
X-Original-To: nanog@nanog.org
In-Reply-To: <alpine.LSU.2.00.1407241725100.13901@hermes-1.csi.cam.ac.uk>
Date: Thu, 24 Jul 2014 12:30:15 -0400
From: Zach Hill <zach.reborn@gmail.com>
To: Tony Finch <dot@dotat.at>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Hi Tony. No firewall in the way.
Physical flow is as below.
Server A -> Nexus 7k -> 3845 router -> Sprint MPLS -> 3845 router -> Cisco
3750x stack -> Server B
On Thu, Jul 24, 2014 at 12:25 PM, Tony Finch <dot@dotat.at> wrote:
> Zach Hill <zach.reborn@gmail.com> wrote:
>
> > What's interesting is this is only affecting a single server and only
> > when traffic is going over the WAN circuit. Testing from Server A to any
> > server on it's network shows it is negotiating window scaling just fine.
>
> Check your firewall isn't buggering about with TCP options.
>
> Tony.
> --
> f.anthony.n.finch <dot@dotat.at> http://dotat.at/
> South German Bight, East Humber: Northeasterly 4 or 5. Slight, occasionally
> moderate. Mainly fair. Moderate or good.
>
