此文件用于自动启动或设置各种不属于标准 Linux 发行版一部分的设置。 您可以在此处设置防火墙特定的设置，例如 IP 转发和防火墙规则。
#!/bin/sh # /etc/rc.d/rc.local: Local system initialization # script. # Put any local setup commands in here: # Turn on Kernel IP forwarding echo "1" > /proc/sys/net/ipv4/ip_forward # Set default policy forwarding packets to DENY ipchains -P forward DENY # Append a rule to forward our packets out of our # local network, masquerading the IP addresses of # our local LAN with the Internet IP address of the # Firewall. ipchains -A forward -j MASQ -s 192.168.0.0/24 -d 0.0.0.0/0 # start up Real Audio Pass thru insmod /lib/modules/2.2.9/ipv4/ip_masq_raudio.o # start up FTP Pass thru insmod /lib/modules/2.2.9/ipv4/ip_masq_ftp.o # start up IRC Pass thru insmod /lib/modules/2.2.9/ipv4/ip_masq_irc.o