Firewall settings under Linux

Effective after reboot
Open: Chkconfig iptables on
OFF: chkconfig iptables off or/sbin/chkconfig--level 2345 iptables off
Open: Service iptables start
Close: Service iptables stop
Iptables Way
To view the firewall status:
/etc/init.d/iptables status
To temporarily turn off the firewall:
/etc/init.d/iptables stop
Restart Iptables:
/etc/init.d/iptables restart

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Firewall settings under Linux