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Query on SSH

Johnson Punniyalingam
Honored Contributor

Query on SSH

what is the maximum number of connection we can have in SSH ?

I did check the man ssh_config file -> points to maximun 10

or it depends on number of pseudo devices

And how about the "batch jobs running" using SSH

does this also require me to increase pseudo devices



Problems are common to all, but attitude makes the difference
5 REPLIES
Michal Kapalka (mikap)
Honored Contributor

Re: Query on SSH

hi,

i thinks ists depend on you server if its enough powerfull and also if you have enough
pseudo devvices.

check this discusion :

http://www.unix.com/unix-advanced-expert-users/46982-max-numer-connections-per-sshd.html


mikap
dirk dierickx
Honored Contributor

Re: Query on SSH

i'm not aware of SSH having this limitation. if there is a limit at all, it will be whatever the OS limits.
Viktor Balogh
Honored Contributor

Re: Query on SSH

you can look for used pty's in glance -> press "t" for "system tables"

You can query the number of ptys from the kernel with kmtune like this: (in 11iv2/v3 look for the kctune command)

# kmtune -q npty
Parameter Current Dyn Planned Module Version
===============================================================================
npty 60 - 60
****
Unix operates with beer.
mvpel
Trusted Contributor

Re: Query on SSH

The "MaxSessions" option in sshd_config is the maximum number of open sessions per network connection, not per system.

That option is tied to a feature in SSH 4.x and up called "connection multiplexing," which allows you to start additional SSH sessions over an existing TCP connection, via the use of a socket:

http://www.debian-administration.org/articles/290

The "MaxSessions" option was introduced in OpenSSH 5.1 to allow more fine-grained administrative control of the multiplexing feature.
Johnson Punniyalingam
Honored Contributor

Re: Query on SSH

Thanks to all, :)
Problems are common to all, but attitude makes the difference