==== 레드햇 리눅스에서 Nat ====

레드햇에서 ipchains 사용

''/etc/rc.d/rc.firewall''

#!/bin/sh/sbin/depmod -a/sbin/modprobe ip_masq_ftp 
#/sbin/modprobe ip_masq_raudio
#/sbin/modprobe ip_masq_irc 
#/sbin/modprobe ip_masq_quake ports=26000,27000,27910,27960 
#/sbin/modprobe ip_masq_cuseeme 
#/sbin/modprobe ip_masq_vdolive 
echo "1" > /proc/sys/net/ipv4/ip_forward 
/sbin/ipchains -M -S 7200 10 160 
/sbin/ipchains -P forward DENY 
/sbin/ipchains -A forward -s 192.168.0.0/24 -j MASQ 
/sbin/ipchains -A forward -s 192.168.1.0/24 -j MASQ 

''/etc/sysconfig/network''
NETWORKING=yes 
HOSTNAME=masq 
GATEWAY=211.205.224.1 

''/etc/sysconfig/network-script/ifcfg-eth0''
DEVICE=eth0 
BOOTPROTO=static 
BROADCAST=211.203.217.255 
IPADDR=211.205.224.11 
NETMASK=255.255.255.0 
NETWORK=211.203.217.0 
ONBOOT=yes 
USERCTL=no 

''/etc/sysconfig/network-script/ifcfg-eth1''
DEVICE=eth1 
ONBOOT=yes 
BOOTPROTO=none 
BROADCAST=192.168.0.255 
NETWORK=192.168.0.0 
NETMASK=255.255.255.0 
IPADDR=192.168.0.1 
USERCTL=no 

''/etc/sysconfig/network-script/ifcfg-eth2''
DEVICE=eth2 
ONBOOT=yes 
BOOTPROTO=none 
BROADCAST=192.168.1.255 
NETWORK=192.168.1.0 
NETMASK=255.255.255.0 
IPADDR=192.168.1.1 
USERCTL=no 

[[http://chonbuk.linux.or.kr/main/study/view.htm?code=network&page=1&num=35&count=31&keyword=|원문]]

==== 데비안에서 Nat 하기 ====

<code>
#! /bin/sh
ifconfig eth0:0 192.168.0.1
iptables -A POSTROUTING -t nat -o eth0 -j MASQUERADE
echo 1 > /proc/sys/net/ipv4/ip_forward
</code>
eth0 에 192.168.0.1 로 엘리어싱 해주고 nat설정했다.


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