#setup network

[anhphuong]

[store] - Share internet connection CentOS 6.5

I have 2 server in LAN

Server 01: + IP LAN (eth0): 192.168.1.200 + IP WAN (eth1): 123.20.33.47

Server 02: + IP LAN (eth0): 192.168.1.199

Now, I want server 02 connect to internet thought server 01. Below are the steps to do:

############################################### *nat :PREROUTING ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A POSTROUTING -s 192.168.1.0/24 -o eth1 -j MASQUERADE COMMIT

*filter :INPUT ACCEPT [10:520] :FORWARD DROP [0:0] :OUTPUT ACCEPT [10:1864] -A FORWARD -i eth1 -o eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT -A FORWARD -i eth0 -o eth1 -j ACCEPT COMMIT ###############################################

Step 2: Enable IP Fowarding (/etc/sysctl.conf)

net.ipv4.ip_foward = 1

Step 3: Actve IP Fowarding to prevent the need of rebooting

echo 1 > /proc/sys/net/ipv4/ip_foward

/sbin/service network restart

Step 4: Config at Server 02 (/etc/sysconfig/network-scripts/ifcfg-eth0)

DEVICE=eth0 ONBOOT=yes NM_CONTROLLED=yes BOOTPROTO=static IPADDR=192.168.1.199 # <= IP LAN server 02 NETMASK=255.255.255.0 # <= doesn't matter GATEWAY=192.168.1.200 # <= IP LAN server 01 DNS1=8.8.8.8 DNS2=4.2.2.2