On Fri, Jan 06, 2006 at 05:05:29PM -0500, Larry Irwin wrote: > -Hopefully this is the right list- > Our ssh connections work fine on all our servers when we connect via > the -local- network. > But, when we ssh from the -internet-, there are long pauses where i/o is > not displayed/echoed to the screen on our Debian servers. > We experience 10 to 30 second pauses after a screen or 2 of display on > Debian Etch kernel 2.6.12, SSH-2.0-OpenSSH_4.2p1 Debian-5. > We have same issue, with slightly shorter pauses, on a Debian Sarge kernel > 2.4.18, OpenSSH_3.4p1 Debian 1:3.4p1-1.woody.3. > We do not experience the problem on a SCO OS5 3.2v5.0.5 kernel, > OpenSSH_2.2.0p1 > Also, if we ssh to SCO first, then locally ssh to Debian, the pauses do not > occur... > So it definitely has nothing to do with the network or infrastructure or > the load on any server, etc. > It is something to do with either Debian or OpenSSH and only is triggered > when the IP source IP is outside the LAN. > Does anyone know what might me contributing to the screen IO issue?
It's possibly an MTU issue which comes good when Path MTU Discovery kicks in. Read http://www.snailbook.com/faq/mtu-mismatch.auto.html and try setting the MTU of the problem machine to 576 to see if the problem goes away. -- Darren Tucker (dtucker at zip.com.au) GPG key 8FF4FA69 / D9A3 86E9 7EEE AF4B B2D4 37C9 C982 80C7 8FF4 FA69 Good judgement comes with experience. Unfortunately, the experience usually comes from bad judgement.
