ssh login delays
Nifty Hat Mitch
mitch48 at sbcglobal.net
Wed Nov 16 00:11:09 UTC 2005
On Sun, Sep 04, 2005 at 11:22:41PM -0400, Bob Hartung wrote:
> Date: Sun, 04 Sep 2005 23:22:41 -0400
> From: Bob Hartung <rwhart at mchsi.com>
> To: fedora-list <fedora-list at redhat.com>
> Subject: ssh login delays
> Reply-To: For users of Fedora Core releases <fedora-list at redhat.com>
>
> Hi all,
> I have two linux boxes at home: FC3 and FC4. I am logging into the
> FC4 box from FC3 and the time from issuing the 'ssh ....' command until
> I see the password prompt is 36 seconds. As I am new to this I have no
> idea where to begin looking for the cause of the delay.
>
> I can login into the FC4 box from my wife's OS X Mac with virtually
> no delay.
>
> Pointers please on where to begin looking for the hangup.
Compare and contrast:
ssh -x user at host
ssh -X user at host
My guess is that the systems are establishing an secure tunnel/ channel
for X11 traffic. The other very common time consumer is host name lookup
both forward and backward (DNS bind). If I recall correctly the ssh
config files (/etc/ssh/*) changed between FC3 and FC4 on some of this.
You can check the the X11 thing by starting xterm and then inspect $DISPLAY.
If $DISPLAY is a "localhost:11.0" something address there is an SSH tunnel...
--
T o m M i t c h e l l
Found me a new place to hang my hat :-)
Found me a cable too.
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