Several operations of linux commands

After logging in to the remote server through ssh, you can continue to log in to other servers on the server,

The command is ssh -p port number ip

 

 

Firewall:

 #Clear all default rules

  iptables -F

yum install iptables

iptables -A INPUT -i eth1 -m iprange --src-range 10.10.10.10-10.10.10 -j ACCEPT

iptables -A INPUT -i eth1 -p tcp --dport 80 -j ACCEPT

iptables -A INPUT -i eth1 -j REJECT

service iptables save

chkconfig --level 35 iptables on

 

iptables -L -n --line-numbers

 //If modified in /etc/sysconfig/iptables, restart first and then save

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