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Can I Limit the IP(s) that sshd Listens On?

To limit the IP addresses which sshd listens on, you just need to modify its settings within the sshd_config file. Follow these 4 easy steps:

  1. First, backup the sshd_config file, then edit it with your favorite editor. 
     
  2. Now, to limit the IPs sshd listens on, you need to change the ListenAddress configuration line:
     
    [email protected] [~]# cd /etc/ssh/
    [email protected] [/etc/ssh]# cp sshd_config sshd_config.save
    [email protected] [/etc/ssh]# vi sshd_config
    [email protected] [/etc/ssh]# diff sshd_config sshd_config.save
    15c15
    < ListenAddress 10.0.0.1

    > #ListenAddress 0.0.0.0
     
  3. Next, restart sshd and verify that it’s listening on the specified address:
     
    [email protected] [/etc/ssh]# /etc/init.d/sshd restart
    Stopping sshd:                                             [  OK  ]
    Starting sshd:                                             [  OK  ]
    [email protected] [/etc/ssh]# netstat -anp | grep sshd
    tcp        0      0 10.0.0.1:22                 0.0.0.0:*                   LISTEN      1718/sshd
     
  4. If you want sshd to listen on more than one address, then add additional ListenAddress lines to the configuration file:

    [email protected] [/etc/ssh]# diff sshd_config sshd_config.save
    15,16c15
    < ListenAddress 10.0.0.1
    < ListenAddress 10.0.0.2

    > #ListenAddress 0.0.0.0
     
    [email protected] [/etc/ssh]# /etc/init.d/sshd restart
    Stopping sshd:                                             [  OK  ]
    Starting sshd:                                             [  OK  ]
    [email protected] [/etc/ssh]# netstat -anp | grep sshd
    tcp        0      0 10.0.0.1:22                 0.0.0.0:*                   LISTEN      1884/sshd
    tcp        0      0 10.0.0.2:22                 0.0.0.0:*                   LISTEN      1884/sshd

And there you have it!

 

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