[113974] in North American Network Operators' Group
RE: Important New Requirement for IPv4 Requests
daemon@ATHENA.MIT.EDU (Skywing)
Fri Apr 24 22:16:34 2009
From: Skywing <Skywing@valhallalegends.com>
To: Kevin Oberman <oberman@es.net>
Date: Fri, 24 Apr 2009 21:16:18 -0500
Cc: "bmanning@vacation.karoshi.com" <bmanning@vacation.karoshi.com>,
"nanog@nanog.org" <nanog@nanog.org>, Joe Greco <jgreco@ns.sol.net>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Keep in mind that you also need to patch your clients for perf improvements=
bidirectionally. As well as patching locally means you must assume respon=
sibility for custom builds for security fixes on all of your clients and se=
rvers.
- S
-----Original Message-----
From: Kevin Oberman <oberman@es.net>
Sent: Friday, April 24, 2009 13:39
To: Skywing <Skywing@valhallalegends.com>
Cc: Jo Rhett <jrhett@netconsonance.com>; Joe Greco <jgreco@ns.sol.net>; bma=
nning@vacation.karoshi.com <bmanning@vacation.karoshi.com>; nanog@nanog.org=
<nanog@nanog.org>
Subject: Re: Important New Requirement for IPv4 Requests
> From: Skywing <Skywing@valhallalegends.com>
> Date: Fri, 24 Apr 2009 10:55:07 -0500
>
> Of course, sftp and other ssh-based protocols are *still* hamstrung to
> a maximum of 32k data outstanding due to hardcoded SSH channel window
> sizes by default for most people, unless you're patching up both your
> clients and servers.
>
> Sadly, this blows ssh out of the water for anything with even modest
> high-bitrate requirements over moderate-BDP links.
The HPN patches for OpenSSH are readily available and, at least on
FreeBSD, including them is just a single checkbox when you install.
That said, I have been told that there is a corner case where a transfer
using the HPN patches will lock up. I have never seen it, but that is
purported to be the reason that OpenBSD has not accepted the patches
for the base OpenSSH software.
--
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman@es.net Phone: +1 510 486-8634
Key fingerprint:059B 2DDF 031C 9BA3 14A4 EADA 927D EBB3 987B 3751
