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What is maximum number of concurrent ssh session can we create?

how to setup a ssh acount with no terminal but port forwarding?How to use SSH private key to log in without entering passphrase every time on Mac OS X Lion?End Reverse SSH sessionssh outgoing connections increase limitSCP connections mysteriously drop; too many connections?When typing in a command, my terminal will often times wrap aroundCannot connect to local SSH server - bad file numberBitvise SSH Server putting extra spaces in sessionSSH Remote Port Forwarding (Tunneling) not working publicly even with GatewayPorts yesWhat means dispatch_protocol_error: type 51 seq 5 when ssh connection fails and how to solve it?

3

I understood the maxconcurrent session depends on MaxSessions attribute and somaxconn

Please help me on this following questions:

1. what is the MaxSessions maximum value


2. why somaxconn value is very important in here. what is the maximum value we can give


3. what exactly the maximum concurrent ssh sessions in number


4. i got to know eacch of my ssh session assigned with a new port number internally as shown in picture . What exactly new port numbers

linux ssh

share|improve this question

edited Dec 3 '16 at 18:28

Jakuje

7,23751929

asked Dec 3 '16 at 3:47

ARUNARUN

162

bumped to the homepage by Community♦ 3 mins ago

This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The maximum value will depend on how much your hardware can support. What sort of testing have you done?
  
  – Ramhound
  Dec 3 '16 at 4:21
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  just for curiosity , what will be the maximum if we have enough hardware to unlimited session
  
  – ARUN
  Dec 3 '16 at 8:44
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  There is always some limit. Just the RAM for example. So you are limited by RAM, swapfile or disk. Mostly you will have first problem with number of processes that service the SSH.
  
  – pbies
  Dec 3 '16 at 18:31
  

  
  
  
  

add a comment | 

3

I understood the maxconcurrent session depends on MaxSessions attribute and somaxconn

Please help me on this following questions:

1. what is the MaxSessions maximum value


2. why somaxconn value is very important in here. what is the maximum value we can give


3. what exactly the maximum concurrent ssh sessions in number


4. i got to know eacch of my ssh session assigned with a new port number internally as shown in picture . What exactly new port numbers

linux ssh

share|improve this question

edited Dec 3 '16 at 18:28

Jakuje

7,23751929

asked Dec 3 '16 at 3:47

ARUNARUN

162

bumped to the homepage by Community♦ 3 mins ago

This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The maximum value will depend on how much your hardware can support. What sort of testing have you done?
  
  – Ramhound
  Dec 3 '16 at 4:21
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  just for curiosity , what will be the maximum if we have enough hardware to unlimited session
  
  – ARUN
  Dec 3 '16 at 8:44
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  There is always some limit. Just the RAM for example. So you are limited by RAM, swapfile or disk. Mostly you will have first problem with number of processes that service the SSH.
  
  – pbies
  Dec 3 '16 at 18:31
  

  
  
  
  

add a comment | 

I understood the maxconcurrent session depends on MaxSessions attribute and somaxconn

Please help me on this following questions:

1. what is the MaxSessions maximum value


2. why somaxconn value is very important in here. what is the maximum value we can give


3. what exactly the maximum concurrent ssh sessions in number


4. i got to know eacch of my ssh session assigned with a new port number internally as shown in picture . What exactly new port numbers

linux ssh

share|improve this question

edited Dec 3 '16 at 18:28

Jakuje

7,23751929

asked Dec 3 '16 at 3:47

ARUNARUN

162

share|improve this question

edited Dec 3 '16 at 18:28

Jakuje

7,23751929

asked Dec 3 '16 at 3:47

ARUNARUN

162

share|improve this question

edited Dec 3 '16 at 18:28

Jakuje

7,23751929

asked Dec 3 '16 at 3:47

ARUNARUN

162

edited Dec 3 '16 at 18:28

Jakuje

7,23751929

edited Dec 3 '16 at 18:28

Jakuje

7,23751929

asked Dec 3 '16 at 3:47

ARUNARUN

162

asked Dec 3 '16 at 3:47

ARUNARUN

162

1 Answer
1

active

oldest

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0

I understood the maxconcurrent session depends on MaxSessions attribute and somaxconn

Nope. Maximum of concurrent session depends on how much is your hardware able to handle. The MaxSessions is used for limiting amount of sessions per single connection. It is usually limited by the maximum of opened files:

$ ulimit -a

[...]

open files                      (-n) 1024

1. what is the MaxSessions maximum value

The value is stored in int data type, which is at least 16 bits by definition, but on nowadays architecture, it is possible to carry up to 2 147 483 647 (which is obviously bigger than the maximum of opened files).

4. I got to know each of my ssh session assigned with a new port number internally as shown in picture . What exactly new port numbers

The port numbers are the ports on the remote hosts and they are assigned randomly, if this is the question. And what you see are not the sessions, but the connection (which from each can operate more sessions using ControlMaster).

share|improve this answer

answered Dec 3 '16 at 18:47

JakujeJakuje

7,23751929

add a comment | 

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0

I understood the maxconcurrent session depends on MaxSessions attribute and somaxconn

Nope. Maximum of concurrent session depends on how much is your hardware able to handle. The MaxSessions is used for limiting amount of sessions per single connection. It is usually limited by the maximum of opened files:

$ ulimit -a

[...]

open files                      (-n) 1024

1. what is the MaxSessions maximum value

The value is stored in int data type, which is at least 16 bits by definition, but on nowadays architecture, it is possible to carry up to 2 147 483 647 (which is obviously bigger than the maximum of opened files).

4. I got to know each of my ssh session assigned with a new port number internally as shown in picture . What exactly new port numbers

The port numbers are the ports on the remote hosts and they are assigned randomly, if this is the question. And what you see are not the sessions, but the connection (which from each can operate more sessions using ControlMaster).

share|improve this answer

answered Dec 3 '16 at 18:47

JakujeJakuje

7,23751929

add a comment | 

0

I understood the maxconcurrent session depends on MaxSessions attribute and somaxconn

Nope. Maximum of concurrent session depends on how much is your hardware able to handle. The MaxSessions is used for limiting amount of sessions per single connection. It is usually limited by the maximum of opened files:

$ ulimit -a

[...]

open files                      (-n) 1024

1. what is the MaxSessions maximum value

The value is stored in int data type, which is at least 16 bits by definition, but on nowadays architecture, it is possible to carry up to 2 147 483 647 (which is obviously bigger than the maximum of opened files).

4. I got to know each of my ssh session assigned with a new port number internally as shown in picture . What exactly new port numbers

The port numbers are the ports on the remote hosts and they are assigned randomly, if this is the question. And what you see are not the sessions, but the connection (which from each can operate more sessions using ControlMaster).

share|improve this answer

answered Dec 3 '16 at 18:47

JakujeJakuje

7,23751929

add a comment | 

I understood the maxconcurrent session depends on MaxSessions attribute and somaxconn

Nope. Maximum of concurrent session depends on how much is your hardware able to handle. The MaxSessions is used for limiting amount of sessions per single connection. It is usually limited by the maximum of opened files:

$ ulimit -a

[...]

open files                      (-n) 1024

1. what is the MaxSessions maximum value

The value is stored in int data type, which is at least 16 bits by definition, but on nowadays architecture, it is possible to carry up to 2 147 483 647 (which is obviously bigger than the maximum of opened files).

4. I got to know each of my ssh session assigned with a new port number internally as shown in picture . What exactly new port numbers

The port numbers are the ports on the remote hosts and they are assigned randomly, if this is the question. And what you see are not the sessions, but the connection (which from each can operate more sessions using ControlMaster).

share|improve this answer

answered Dec 3 '16 at 18:47

JakujeJakuje

7,23751929

$ ulimit -a

[...]

open files                      (-n) 1024

share|improve this answer

answered Dec 3 '16 at 18:47

JakujeJakuje

7,23751929

answered Dec 3 '16 at 18:47

JakujeJakuje

7,23751929

answered Dec 3 '16 at 18:47

JakujeJakuje

7,23751929