默认/etc/sysoncifg/iptables-config的配置内容：
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# Load additional iptables modules (nat helpers)# Default: -none-# Space separated list of nat helpers (e.g. 'ip_nat_ftp ip_nat_irc'), which# are loaded after the firewall rules are applied. Options for the helpers are# stored in /etc/modprobe.conf.IPTABLES_MODULES="ip_conntrack_netbios_ns"# Unload modules on restart and stop# Value: yes|no, default: yes# This option has to be 'yes' to get to a sane state for a firewall# restart or stop. Only set to 'no' if there are problems unloading netfilter# modules.IPTABLES_MODULES_UNLOAD="yes"# Save current firewall rules on stop.# Value: yes|no, default: no# Saves all firewall rules to /etc/sysconfig/iptables if firewall gets stopped# (e.g. on system shutdown).IPTABLES_SAVE_ON_STOP="no"# Save current firewall rules on restart.# Value: yes|no, default: no# Saves all firewall rules to /etc/sysconfig/iptables if firewall gets# restarted.IPTABLES_SAVE_ON_RESTART="no"# Save (and restore) rule and chain counter.# Value: yes|no, default: no# Save counters for rules and chains to /etc/sysconfig/iptables if# 'service iptables save' is called or on stop or restart if SAVE_ON_STOP or# SAVE_ON_RESTART is enabled.IPTABLES_SAVE_COUNTER="no"# Numeric status output# Value: yes|no, default: yes# Print IP addresses and port numbers in numeric format in the status output.IPTABLES_STATUS_NUMERIC="yes"# Verbose status output# Value: yes|no, default: yes# Print info about the number of packets and bytes plus the "input-" and# "outputdevice" in the status output.IPTABLES_STATUS_VERBOSE="no"# Status output with numbered lines# Value: yes|no, default: yes# Print a counter/number for every rule in the status output.IPTABLES_STATUS_LINENUMBERS="yes" |
IPTABLES_MODULES="ip_conntrack_netbios_ns"
在防火墙被激活时，指定一组独立的空间额外加载iptables模块，系统启动，加载防火墙模块，会打印：Loading additional iptables modules: ip_conntrack_netbios_ns[ OK ]
IPTABLES_MODULES_UNLOAD="yes"
在重新启动和停止iptables模块时，是否卸载此模块。
IPTABLES_SAVE_ON_STOP="no"
当防火墙停止时，保存当前防火墙规则到iptables文件，no ：（默认值）不保存当前的规则到iptables文件。
IPTABLES_SAVE_ON_RESTART="no"
当防火墙重启时：service iptables restart，保存当前防火墙规则到iptables文件，no ：（默认值）不保存当前的规则到iptables文件。
IPTABLES_SAVE_COUNTER="no"
保存并恢复所有chain和规则中的数据包和字节计数器，yes：保存计数器的值，no：（默认值）不保存计数器值。
IPTABLES_STATUS_NUMERIC="yes"
输出的IP地址是数字的格式，而不是域名和主机名的形式，yes：（默认值）在状态输出中只包括IP地址，no：在状态输出中返回域名或主机名。
IPTABLES_STATUS_VERBOSE="no"
输出iptables状态时，是否包含输入输出设备，yes：包含，no：（默认值）不包含。
IPTABLES_STATUS_LINENUMBERS="yes"
输出iptables状态时，是否同时输出每条规则的匹配数，yes：（默认值）输出，no：不输出。
查看防火墙状态：service iptables status
重启防火墙：service iptables restart
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# service iptables restartiptables: Flushing firewall rules: [ OK ]iptables: Setting chains to policy ACCEPT: filter [ OK ]iptables: Unloading modules: [ OK ]iptables: Applying firewall rules: [ OK ] |
重启防火墙，清除规则和卸载模块，然后再加载新的规则。