우분투 shell script 사용 및 부팅 시 자동으로 실행

ubuntu 10.04

1) prepare shell script file to ipforward

gedit netshare.sh

2) write next scripts in the netshare.sh

#! /bin/bash          

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

iptables -P FORWARD DROP

iptables -A FORWARD -o eth0 -j ACCEPT

iptables -A FORWARD -o eth1 -j ACCEPT

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

ifconfig eth1 192.168.0.1 up

/etc/init.d/networking restart

3) setting to use at the booting

3-1) copy the file to /etc/init.d

cp netshare.sh /etc/init.d/netshare.h

3-2) set permission

chmod +x netshare.sh

3-3) update shell scripts

update-rc.d netshare.sh defaults