از اونجایی که nat کردن یکی از مئارد خیلی پر مصرف هست گفتم این مطلب رو بزارم شاید به درد دوستان خورد
و به دلیل این که چند تا دستور بیشتر نیست و خیلی روان نوشته شده دیگه مطلب رو ترجمه نکردم
پیکره بندی nat با استفاده از iptables بصورت قدم به قدم
نیازمندیها :
cpu: پنتیوم 2 به بالا
سیستم عامل لینوکس
iptables
2 عدد کارت شبکه
Step #1. Add 2 Network cards to the Linux box
Step #2. Verify the Network cards, Wether they installed properly or not
ls /etc/sysconfig/network-scripts/ifcfg-eth* | wc -l
( The output should be "2")
(Step #3. Configure eth0 for Internet with a Public ( IP External network or Internet
cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=none
BROADCAST=xx.xx.xx.255 # Optional Entry
HWADDR=00:50:BA:88:72: D4 # Optional Entry
IPADDR=xx.xx.xx.xx
NETMASK=255.255.255.0 # Provided by the ISP
NETWORK=xx.xx.xx.0 # Optional
ONBOOT=yes
TYPE=Ethernet
USERCTL=no
IPV6INIT=no
PEERDNS=yes
GATEWAY=xx.xx.xx.1 # Provided by the ISP
(Step #4. Configure eth1 for LAN with a Private IP (Internal private network
cat /etc/sysconfig/network-scripts/ifcfg-eth1
BOOTPROTO=none
PEERDNS=yes
HWADDR=00:50:8B:CF:9C:05 # Optional
TYPE=Ethernet
IPV6INIT=no
DEVICE=eth1
NETMASK=255.255.0.0 # Specify based on your requirement
BROADCAST=""
IPADDR=192.168.2.1 # Gateway of the LAN
NETWORK=192.168.0.0 # Optional
USERCTL=no
ONBOOT=yes
(Step #5. Host Configuration (Optional
cat /etc/hosts
127.0.0.1 nat localhost.localdomain localhost
Step #6. Gateway Configuration
cat /etc/sysconfig/network
NETWORKING=yes
HOSTNAME=nat
GATEWAY=xx.xx.xx.1 # Internet Gateway, provided by the ISP
Step #7. DNS Configuration
cat /etc/resolv.conf
nameserver 203.145.184.13 # Primary DNS Server provided by the ISP
nameserver 202.56.250.5 # Secondary DNS Server provided by the ISP
Step #8. NAT configuration with IP Tables
# Delete and flush. Default table is "filter". Others like "nat" must be explicitly stated.
iptables --flush # Flush all the rules in filter and nat tables
iptables --table nat --flush
iptables --delete-chain
# Delete all chains that are not in default filter and nat table
iptables --table nat --delete-chain
# Set up IP FORWARDing and Masquerading
iptables --table nat --append POSTROUTING --out-interface eth0 -j MASQUERADE
iptables --append FORWARD --in-interface eth1 -j ACCEPT
# Enables packet forwarding by kernel
echo 1 > /proc/sys/net/ipv4/ip_forward
#Apply the configuration
service iptables restart
Step #9. Testing
# Ping the Gateway of the network from client system
ping 192.168.2.1
Try it on your client systems
ping google.com
( Configuring PCs on the network (Clients
All PC's on the private office network should set their "gateway" to be the local private network IP address of the Linux gateway computer.
The DNS should be set to that of the ISP on the internet.
Windows '95, 2000, XP, Configuration:
Select "Start" + Settings" + "Control Panel"
Select the "Network" icon
Select the tab "Configuration" and double click the component "TCP/IP" for the ethernet card.
(NOT the TCP/IP -> Dial-Up Adapter)
Select the tabs:
"Gateway": Use the internal network IP address of the Linux box.
(192.168.2.1)
"DNS Configuration": Use the IP addresses of the ISP Domain Name Servers.
(Actual internet IP address)
"IP Address": The IP address (192.168.XXX.XXX - static) and netmask (typically 255.255.0.0 for a small local office network) of the PC can also be set here.
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