Use of TCP_NODELAY in commercial SSH
Tobias Ringstrom
tori at ringstrom.mine.nu
Fri Feb 1 08:29:51 EST 2002
In order to test my overlapping request path for sftp on another ssh
server, I downloaded ssh2 version 3.1.0 from ssh.com. Having downloaded
it, I decided to study the use of TCP_NODELAY in that implementation.
Here's what I found:
* Both ssh2 and sshd2 has a NoDelay config option which is false by
default.
* The ssh2 client does not enable or disable NoDelay because of a channel
type (such as pty or X11).
* The sftp2 client uses "-o NoDelay=yes" when starting its ssh "proxy"
which helps get, but not put.
* The sftp2 server does not enable NoDelay (since there is no way to do so
I guess).
/Tobias
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