& Nbsp; enable firewall for Linux System 1) enable after restart: chkconfigiptableson disable: chkconfigiptablesoff2) enable immediately after restart: disable serviceiptablesstart disable: serviceiptablesstop
Enable firewall in Linux
1) takes effect after restart
Enable: chkconfig iptables on
Close: chkconfig iptables off
2) takes effect immediately and becomes invalid after restart
Enable: service iptables start
Disable: service iptables stop
You can use the preceding command to enable or disable other services in Linux.
When the firewall is enabled, make the following settings to enable the relevant ports.
Modify the/etc/sysconfig/iptables file and add the following content:
-A RH-Firewall-1-INPUT-m state -- state NEW-m tcp-p tcp -- dport 80-j ACCEPT
-A RH-Firewall-1-INPUT-m state -- state NEW-m tcp-p tcp -- dport 22-j ACCEPT
View all processes, including services. in the command, ps-aux is netconfig, which is the Nic configuration tool on the character interface in redhat.
Chkconfig -- list
You can list the default startup statuses of sysV and xinet services at Each runlevel.
Service name parameters
The parameter for viewing the status seems to be stat.
Self-starting service
Ntsysv