This script was tested on Red Hat, Fedora, Centos. Do not use on some other distribution because they use other file for configuration.
Also this script work on a connection with static IP, not only that use DHCP server.
Download file from here
Download this file:
chmod 700
./gate
#!/bin/bash
#roted by Matrafox
#radu[at]matrafox.info
clear
echo
echo ” We consider that we have 2 ethernet card.”
echo ” eth0 internet ethernet, eth1 LAN card”
echo
echo ” Warning”
echo ” If at some point you type something wrong you must stop the scrpt with CTRL+C and run it agan”
echo
echo
echo “For the begining please type hostname= (EX: ab.matrafox.info)”
read rom1
echo
echo ” Type the Ip of gateway that was give to ou from ISP ”
read rom2
echo
echo > /etc/sysconfig/network
echo ‘NETWORKING=yes’ > /etc/sysconfig/network
echo ‘HOSTNAME=”‘$rom1′”‘ >> /etc/sysconfig/network
echo ‘GATEWAY=”‘$rom2′”‘ >> /etc/sysconfig/network
echo ‘GATEWAYDEV=”eth0″‘ >> /etc/sysconfig/network
echo ‘FORWARD_IPV4=”yes”‘ >> /etc/sysconfig/network
echo
echo ” Type the Ip that was give to you from ISP”
read rom3
echo
echo ” Type the netmask that was give to you from ISP ”
read rom4
echo
echo > /etc/sysconfig/network-scripts/ifcfg-eth0
echo ‘DEVICE=eth0’ >> /etc/sysconfig/network-scripts/ifcfg-eth0
echo ‘BOOTPROTO=static’ >> /etc/sysconfig/network-scripts/ifcfg-eth0
echo ‘IPADDR=’$rom3 >> /etc/sysconfig/network-scripts/ifcfg-eth0
echo ‘NETMASK=’$rom4 >> /etc/sysconfig/network-scripts/ifcfg-eth0
echo ‘ONBOOT=yes’ >> /etc/sysconfig/network-scripts/ifcfg-eth0
echo
echo ” Type DNS1 from the ISP ”
read rom10
echo ” Type DNS2 from the ISP ”
read rom11
echo > /etc/resolv.conf
echo ‘nameserver ‘$rom10 >> /etc/resolv.conf
echo ‘nameserver ‘$rom11 >> /etc/resolv.conf
clear
echo ” Now tipe the local ip for LAN ”
echo ” This ip must use like gateway on local station from network ”
echo ” Some exammple ”
echo ” 172.18.0.2-172.18.0.254 ”
echo ” Ex: 172.18.0.1 try this here”
read rom5
echo
echo ” Type netmask, you must use same on network workstation ”
echo ” if you don’t know what to type use”
echo ” 255.255.255.0 ”
read rom6
echo
echo > /etc/sysconfig/network-scripts/ifcfg-eth1
echo ‘DEVICE=eth0’ >> /etc/sysconfig/network-scripts/ifcfg-eth1
echo ‘BOOTPROTO=static’ >> /etc/sysconfig/network-scripts/ifcfg-eth1
echo ‘IPADDR=’$rom5 >> /etc/sysconfig/network-scripts/ifcfg-eth1
echo ‘NETMASK=’$rom6 >> /etc/sysconfig/network-scripts/ifcfg-eth1
echo ‘ONBOOT=yes’ >> /etc/sysconfig/network-scripts/ifcfg-eth1
echo
clear
echo ” WARNING – if it is something wat you type wrong type CTRL+C ”
echo “After the program end please reboot the sistem ”
echo
echo
echo ” This program was rote by Matrafox”
echo ” Live like there is no tomorow, the future is uncertain !”
read rom7
clear
echo ‘echo ””‘1′””> /proc/sys/net/ipv4/ip_forward’ >> /etc/rc.d/rc.local
echo ‘modprobe iptable_nat’ >> /etc/rc.d/rc.local
echo ‘/sbin/iptables -t nat -F’ >> /etc/rc.d/rc.local
echo ‘/sbin/iptables -F’ >> /etc/rc.d/rc.local
echo ‘/sbin/iptables -t nat -A POSTROUTING -o eth0 -j SNAT –to ‘$rom3 >> \
/etc/rc.d/rc.local
