Restricted specify host to connect SSH

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It can be use iptables to accept port 22 from specify host.

iptables -D INPUT -s ip_server1 -p tcp --dport 22 -j ACCEPT
iptables -D INPUT -p tcp --dport 22 -j DROP
iptables -I INPUT -p tcp --dport 22 -j DROP
iptables -I INPUT -s ip_server1 -p tcp --dport 22 -j ACCEPT

It also can restrict by sshd_config file

AllowUsers account1@ip_server1 account1@ip_server2