Yes you need to do NATing Then if you are using static IPs . remember to add DNS ips on the clients. On Fri, Mar 28, 2014 at 12:50 PM, Thuo Wilson <lixton@gmail.com> wrote:
On 28 March 2014 12:18, Cynthia Wahome <cwahome@jambo.co.ke> wrote:
Hello All I am not an expert in Networking and hence i am posting this here for assistance.
I have a CentOS Box which has 2 NICs My setup is as follows on the CentOS server.
My WAN IP is 192.168.6.142/24 My WAN Gateway is 192.168.6.1/24 My LAN IP is 10.10.20.1/24
My server is able to browse the internet well. i have connected my laptop network port to the LAN port of the server. Laptop IP is 10.10.20.12/24 and i have put gateway to be 10.10.20.1
I am able to reach the gateway ie 10.10.20.1 from the laptop,however i cannot reach anything on the internet (e.g i am unable to ping 4.2.2.2 or 8.8.8.8) Basically i cannot go outside to the internet.
On the server,when i do a netstat -rn,i get the following output
[root@linuxlearn ~]# netstat -rn Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 192.168.6.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 10.10.20.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2 0.0.0.0 192.168.6.1 0.0.0.0 UG 0 0 0 eth1 [root@linuxlearn ~]#
I have not put a gateway on the LAN
As you can see,the default route is OK. i would like to be able to access the Internet from my laptop.
My questions are?
1)- Is there any config i have not done well or misconfigured? (My thinking is that my laptop should be able to go to the internet because the routing appears OK,however i stand to be corrected.) 2)- Do i need to do any NATing somewhere?
Kindly give me your thoughts on this issue.
Regards Cynthia
I will assume some few things here: That your WAN/Outbound is ether0 and inbound is ether1 Behold:
Exec this on command line as root: Paste one of the below:
iptables -t nat -A POSTROUTING -s 10.10.20/255.255.255.0 -o eth0 -j MASQUERADE *OR the same principle here but you need to change SNAT ip everytime u change provider or WAN ip* iptables -t nat -A POSTROUTING -s 10.10.20/255.255.255.0 -j SNAT --to-source 192.168.6.142
service iptables save service iptables restart
*Finally enable packet forwarding in an easy way:*
echo 1 > /proc/sys/net/ipv4/ip_forward sysctl -p
Start browsing.
Kind Regards, Wilson./
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