packet forwarding using IPtables

Discussion in 'Installation/Configuration' started by turki_00, May 4, 2011.

  1. turki_00

    turki_00 New Member

    I have 2 Ubuntu boxes sitting in the same subnet; server 1 [] and server 2 []
    What I am trying to achieve here is the following:

    server 1 act as a gateway or proxy to server 2, meaning that server 1 is exposed to the Internet and all traffic to server 2 should go though it (i hope!).

    server 2 act as application server and I don't want a direct access to it from the internet. I want all the inbound traffic comes through server 1.

    for testing purposes, i will limit the traffic to simple http or port 80

    in server 1, i have done the following settings:
    iptables -t nat -A PREROUTING -p tcp -i eth0 -d --dport 80 -j DNAT --to
    iptables -A FORWARD -p tcp -i eth0 -d --dport 80 -j ACCEPT

    In server 1, I've edited the value of net.ipv4.ip_forward to equal 1 (uncomment that line in /etc/sysctl.conf)

    Currently, both server 1 and server 2 has its own apache2 servers with different index.html files.

    the problem is, when i browse to server 1, I am still seeing its index page rather than being forwarded to the index page of server 2.

    how can i achieve the traffic forwarding from server 1 to server 2 when my browser pointing to server 1?

    So, simply:

    Internet -> server 1 ( -> server 2 (

    Thank you in advance

Share This Page