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How much memory does SSH session take from a WiNG device?

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TitleHow much memory does SSH session take from a WiNG device?
Question
How much memory does every SSH session take from a WiNG device?
Environment
  • All Summit WM3000 Series Controllers
  • ExtremeWiNG Controllers
  • WirelessWiNG Controllers
  • ExtremeWiNG Access Points
  • WirelessWiNG Acess Points
  • WiNG 5.5+ Software
Answer
Using SSH to manage devices you may observe that it takes over ~5MB from memory to allow single SSH connection
VX# service show mem on AP7131
Total Memory:        90900 kB
Available Memory:    30816 kB

VX# show sessions on AP7131
INDEX   COOKIE  NAME            START TIME              FROM                  ROLE
1       3       snmp            2018-01-03 11:20:17     127.0.0.1             superuser
2       4       snmp2           2018-01-03 11:20:17     127.0.0.1             superuser

VX# ssh 88.88.88.79 admin
admin@88.88.88.79's password:

AP7131> enable
AP7131# service show mem
Total Memory:        90900 kB
Available Memory:    25684 kB

AP7131# show sessions
INDEX   COOKIE  NAME            START TIME              FROM                  ROLE
1       48      admin           2018-01-03 15:30:22     192.168.7.205         superuser
2       3       snmp            2018-01-03 11:20:17     127.0.0.1             superuser
3       4       snmp2           2018-01-03 11:20:17     127.0.0.1             superuser

Additional session will consume the same amount of memory 
AP7131# service show mem
Total Memory:        90900 kB
Available Memory:    20420 kB

AP7131# show sessions
INDEX   COOKIE  NAME            START TIME              FROM                  ROLE
1       48      admin           2018-01-03 15:30:22     192.168.7.205         superuser
2       49      admin           2018-01-03 15:33:05     88.88.88.88           superuser
3       3       snmp            2018-01-03 11:20:17     127.0.0.1             superuser
4       4       snmp2           2018-01-03 11:20:17     127.0.0.1             superuser
Additional notes
Using MINT to connect to the device is little more sensitive
VX# connect AP7131
<omitted>
AP7131# service show mem
Total Memory:        90900 kB
Available Memory:    26084 kB

AP7131# show sessions
INDEX   COOKIE  NAME            START TIME              FROM                  ROLE
1       50      admin           2018-01-03 15:36:11     127.0.0.1             superuser
2       3       snmp            2018-01-03 11:20:17     127.0.0.1             superuser
3       4       snmp2           2018-01-03 11:20:17     127.0.0.1             superuser

See also Why should I disable SSH and SNMP on older WiNG APs?
 

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