Subject: Re: OpenSSH 3.1 behaving bad + TCP window update bug?
To: Tomas Svensson <>
From: IWAMOTO Toshihiro <>
List: tech-net
Date: 03/15/2002 18:32:05
At Fri, 15 Mar 2002 02:30:29 +0100,
Tomas Svensson wrote:
> OpenSSH 3.1 is still enabling TCP_NODELAY on all connections, which is
> most likely a bad thing and is causing a packet flood when doing
> things like ls -l over the Internet.

> It is common that people think this stalling depends on a bad link,
> but it doesn't happen with SSH Inc's sshd (because it sends big enough
> frames). FreeBSD were probably going to disable TCP_NODELAY for
> interactive ssh connections, but I haven't followed that closely.

Disabling TCP_NODELAY has a negative effect on local area connections.
A while ago, TCP_NODELAY wasn't enabled on IPv6 connection, and I was
always annoyed by clumsy response of vi, less and etc.

IWAMOTO Toshihiro