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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:

    root@root [~]# cd /etc/ssh/
    root@root [/etc/ssh]# cp sshd_config sshd_config.save
    root@root [/etc/ssh]# vi sshd_config
    root@root [/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:

    root@root [/etc/ssh]# /etc/init.d/sshd restart
    Stopping sshd: [ OK ]
    Starting sshd: [ OK ]
    root@root [/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:

    root@root [/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

    root@root [/etc/ssh]# /etc/init.d/sshd restart
    Stopping sshd: [ OK ]
    Starting sshd: [ OK ]
    root@root [/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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