How to configure iptables and ssh in Linux

Resource: 10 centos servers, ip address: 192.168.1.11-192.168.1.20 requirement: ssh can be accessed by 10 servers, and 10.0.60.0/24 and 192.168.1.200; others reject 1, node1 write the following script iptables. shiptables-Fiptables-Xiptables-IINPUT-pTCP -- d resources: 10 CentosServer, ip: 192.168.1.11-192.168.1.20
Requirement: ssh can be accessed by 10 hosts, and 10.0.60.0/24 and 192.168.1.200; other requests are rejected.

1. write the following script on node1. Iptables. Sh
Iptables-F
Iptables-X
Iptables-I INPUT-p TCP -- dport 22-j REJECT
Iptables-I INPUT-pTCP -- dport 22-s 10.0.60.0/24-j ACCEPT
Iptables-I INPUT-pTCP -- dport 22-s 192.168.1.200-j ACCEPT
For I in {11 .. 20}
Do
Iptables-I input-p TCP -- dport 22-s 192.168.1. $ I-j ACCEPT
Done

2. run the command on node1.
# Chmod + x iptables. sh
# For I in {11 .. 20}; do scp iptables. sh node $ I:/root; done
# For I in {11 .. 20}; do ssh node $ I '/root/iptables. sh'; done
# For I in {11 .. 20}; do ssh node $ I '/etc/init. d/iptablessave'; done
# View iptables-L-n