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쩝...거의 다되가는거 같은데 잘안됩니다...
 OS : 한컴리눅스 2.0 
통신  :  한국통신 ADSL
ntsysv에서 ipchain은 껐음.
인터넷 연결된상태임.
 리눅스 서버.
#----------/etc/sysconfig/network-scripts/ifcfg-eth0-------------- 
DEVICE=eth0
BOOTPROTO=none
ONBOOT=yes
IPADDR=192.168.1.1
NETMASK=255.255.255.0
BROADCAST=192.168.1.255
NETWORK=192.168.1.0
USERCTL=no
#----------/etc/sysconfig/network-scripts/ifcfg-eth0-------------- 

#----------/etc/sysconfig/network-scripts/ifcfg-eth1-------------- 
 DEVICE=eth1 
 ONBOOT=yes 
 BOOTPROTO=static 
 IPADDR=192.168.1.2 
 NETMASK=255.255.255.0 
 NETWORK=192.168.1.0 
 BROADCAST=192.168.1.255 
 USERCTL=no 
 #----------/etc/sysconfig/network-scripts/ifcfg-eth1-------------- 

윈도우2000 프로페셔널 클라이언트 
ip주소 192.168.1.3 
서브넷마스크 255.255.255.0 
기본게이트웨이 192.168.1.2 
 
 기본dns 168.126.63.1 
 보조dns 168.126.63.2 

마지막으로 /etc/rc.d/rc.local 젤 하단에 아래 두줄 추가.
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
echo 1>/proc/sys/net/ipv4/ip_forward

<핑 테스트>
리눅스 ------> 윈도(192.168.1.3)  잘됨
윈도(192.168.1.3) ---> 리눅스(192.168.1.1)잘됨
윈도(192.168.1.3) ---> 리눅스(192.168.1.2)잘됨 

[root@localhost /root]# lsmod
Module                  Size  Used by
ipt_MASQUERADE          1648  1  (autoclean)
iptable_nat            15072  0  (autoclean) [ipt_MASQUERADE]
ip_conntrack          15088  1  (autoclean) [ipt_MASQUERADE iptable_nat]
ip_tables              10688  4  [ipt_MASQUERADE iptable_nat]
ppp_async              6864  1  (autoclean)
ppp_generic            17264  4  (autoclean) [ppp_async]
autofs                11040  1  (autoclean)
ne2k-pci                4832  1  (autoclean)
8390                    6336  0  (autoclean) [ne2k-pci]
8139too                15984  1  (autoclean)
usb-uhci              19984  0  (unused)
usbcore                48096  1  [usb-uhci]

[root@localhost /root]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:02:2A:C1:3D:3E  
          inet addr:192.168.1.1  Bcast:192.168.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2123 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2266 errors:0 dropped:0 overruns:0 carrier:0
          collisions:7 txqueuelen:100 
          Interrupt:5 Base address:0x1000 
 eth1      Link encap:Ethernet  HWaddr 52:54:BB:DE:7A:1A  
          inet addr:192.168.1.2  Bcast:192.168.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:141 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100 
          Interrupt:11 Base address:0xc400 
 lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:18 errors:0 dropped:0 overruns:0 frame:0
          TX packets:18 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
 ppp0      Link encap:Point-to-Point Protocol  
          inet addr:61.75.146.118  P-t-P:211.55.173.217  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1492  Metric:1
          RX packets:1983 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2181 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3 
 랜카드 땜시 한참 고생하다가 그걸 해결하고 나니깐 떠 안되네요.
리플좀 달아주세요..
 --
힘들다.