topic Re: slow ssh in Operating System - HP-UX

slow ssh

Jan Hawes — Wed, 26 Feb 2003 14:11:46 GMT

Hallo,

we have some shell script that uses remsh and rcp and we want to replace them with ssh and scp. It works fine but it takes a lot of time.
A "remsh ls" needs 0.1 seconds and a "ssh ls" needs 3.4 seconds.

When I start ssh with the "-d" option then I geht the following failed messages.
Do you know how I can fix that problem?

...
debug1: Starting up PAM with username "jaha"
debug1: PAM setting rhost to "client"
Failed none for jaha from 53.141.246.120 port 59110 ssh2
debug1: userauth-request for user jaha service ssh-connection method external-keyx
debug1: attempt 1 failures 1
debug1: No suitable client data
Failed external-keyx for jaha from 53.141.246.120 port 59110 ssh2...

Re: slow ssh

harry d brown jr — Wed, 26 Feb 2003 14:27:35 GMT

The only way to "fix it" is to get a bigger faster machine and a bigger faster network.

ssh is encrypting and decrypting on the otherside, so it's just a fact of life that it's going to be slower.

live free or die
harry

Re: slow ssh

Chris Wong — Wed, 26 Feb 2003 20:46:14 GMT

Are you using /dev/random? If you have 11i, implement this and it will run much faster.

http://newfdawg.com/SSHpart5.htm

Is the problem just that it is slow or do you want it to use one of these failed authentication methods? If so, could you post your config files?

- Chris

Re: slow ssh

Chris Vail — Wed, 26 Feb 2003 21:08:29 GMT

As Harry Brown points out, ssh and scp is slower because of the encryption/decryption that is happening. Let me add that, once this initial handshaking has happened, the communication is just as fast as remsh or rcp. I've attached my ever-popular document on installing and using ssh/scp. From your debug output, I think you've got a problem with the handshaking--perhaps a permission issue. Take a look and try it again. It'll never be as fast as remsh/rcp, but you can help it out a bit with proper configuration.

Chris