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Thread: IPTables

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  1. #1
    Join Date
    May 2007
    Location
    North Wales, UK
    Beans
    22
    Distro
    Ubuntu 8.04 Hardy Heron

    IPTables

    Hi there,

    I currently have a router set to forward all traffic to my server (router is 192.168.0.1, server eth0 is 192.168.0.2).

    The server is my firewall, it has a list of ports to forward to specific computers inside my network, for example the microsoft remote desktop port is forwarded to 10.0.0.50.

    My ISP has given me 8 IP addresses of which i can only use 5.

    My dilemma is i want anything on address 1 (lets say 1.2.3.1) to be handled as it is at the moment, by my server but _ANY_ traffic that is on ip 1.2.3.6 to be forwarded to an internal machine (10.0.0.10) to handle, essentially DMZing it on the perticular IP. I have looked around on the internet but can only find specific port forwards but it does not help when trying to foward any traffic on a specific IP.

    Essentially i am giving my other computer a public facing ip address but the nic on said computer has an internal one?

    Can anyone help me?

  2. #2
    Join Date
    Mar 2007
    Location
    Denver, CO
    Beans
    7,554
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: IPTables

    Can you explain better what you want to do? Iptables is able only to sort by tcp/udp/icmp header information. So if there is something unique in these packet type headers that contain the information you would like to sort by, then iptables can do it!

  3. #3
    Join Date
    May 2007
    Location
    North Wales, UK
    Beans
    22
    Distro
    Ubuntu 8.04 Hardy Heron

    Re: IPTables

    Well, as mentioned, i have 5 ip addresses. basically i want anything received on ip 78.33.121.166 to be forwarded by iptabls to another computer on my network

    Anything received on 78.33.121.161 would just be handled by the server running iptables

  4. #4
    Join Date
    Mar 2007
    Location
    Denver, CO
    Beans
    7,554
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: IPTables

    How many network cards do you have, or all your ip addresses externally translated to one IP address? Im confused by how one network card can be assigned more than one IP address? Iptables seems like it would be able to do what you want in that it would be able to filter by destination IP address, however I'm confused about your setup.

  5. #5
    Join Date
    May 2007
    Location
    North Wales, UK
    Beans
    22
    Distro
    Ubuntu 8.04 Hardy Heron

    Re: IPTables

    ok, i will try to explain my setup

    Code:
    ip
    78.33.121.161
    78.33.121.162
    78.33.121.163
    78.33.121.164
    78.33.121.165
    78.33.121.166
        |
     Router (192.168.0.1)
    (Router is DMZ'd to 192.168.0.2)
        |
    NIC 1 (192.168.0.2)
        |___SERVER_____
                      |
                   NIC 2 (10.0.0.7)
                      |
              ______Switch
              |       
    Rest of network including other web server 10.0.0.1

    All i want is any connections on 78.33.121.166 to be routed to 10.0.0.1 and any other connections on any other ip is handeld by main server

    I hope this has cleared that up?

    P.S my router is useless, hence the DMZ to a linux box with iptables doing all my routing
    Last edited by tsumaru; August 4th, 2008 at 10:23 PM.

  6. #6
    Join Date
    May 2007
    Location
    North Wales, UK
    Beans
    22
    Distro
    Ubuntu 8.04 Hardy Heron

    Re: IPTables

    any takers?

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