$ cat >> /etc/sysconfig/network
FORWARD_IPV4=true
^D

$ cat >> /etc/rc.d/rc.local
/sbin/depmod -a
/sbin/modprobe ip_masq_ftp
/sbin/modprobe ip_masq_raudio
/sbin/modprobe ip_masq_irc
/sbin/ipchains -P forward DENY
/sbin/ipchains -A forward -s 192.168.10.0/24 -j MASQ
^D

$ echo 1 > /proc/sys/net/ipv4/ip_forward