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Hi. I've given a project of setting up a firewall in my office. I have only found documentation for masquerading using one real IP address and a private network type ...
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  1. #1
    Linux User
    Join Date
    Nov 2002
    Posts
    420

    linux routing inside a network segment


    Hi. I've given a project of setting up a firewall in my office.
    I have only found documentation for masquerading using one
    real IP address and a private network type 192.168.x.x
    I did that and it worked, the problem is that I need real addresses,
    and my linux box is between the gateway and all my network.
    I configured the routing table with the command ip and I can
    access the gateway and all the nodes on my network, but it
    just doesn't forward.

    What am I doing wrong? I someone could just help me, it would
    save my job.

    Thanks

  2. #2
    Linux Enthusiast
    Join Date
    Jun 2002
    Location
    San Antonio
    Posts
    621
    sounds like quite the job you have there. Are you using standard port forwarding for some addresses and masquerading for others? For instance:
    Comp1 = 65.33.76.33
    Comp2 = 65.33.76.34
    Comp3 = 65.33.76.35
    Comp[4-9] = 65.33.76.36
    Comp[10-99] = 65.33.76.37

    If you are then you just have to set up different rules in the /etc/sysconfig/iptables (or ipchains depending) that just sort on IP addresses. Like (give me a break this is from memory):
    -A -s 0/0 -d 65.33.76.33/255 -j FORWARD_1
    -A -s 0/0 -d 65.33.76.36/255 -j MASQUERADE_1

    etc.
    where FORWARD_1 and MASQUERADE_1 are other chains you set up to send it to certain areas of your network.
    I respectfully decline the invitation to join your delusion.

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