Important New Requirement for IPv4 Requests

From: Skywing <>
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.