Setting up a NAT Router that will route between 3 networks

hinkle_at_interwork.sdsu.edu
Date: 07/29/03

  • Next message: Ryan Mooney: "Re: 10Ge drivers?" 
    To: freebsd-questions@freebsd.org
Date: Mon, 28 Jul 2003 18:14:29 -0400

    I was wondering how to modify the appropriate files to setup a FreeBSD
    computer to act as a NAT Router, that would do the following:

    One NIC card is connected to a private network, with an IP address of
    192.168.0.50. This will act as the gateway to all the computers in the
    technology center, to connect to the internet (Nic Card 2, Provided by Cox)
    and to the SDSU connection (Nic Card 3).

    We need the NAT Router to act as follows:

    1) When computers of the private network access the general internet, we
    need the NAT to translate to the Cox.Net IP, except for all addresses
    beginning with 130.191.X.X or 146.244.X.X, or all traffic on port 1214
    (KaZaa), which we need to go the SDSU Connection.

    2) When the IP Address the data is going to begins with 146.244.X.X or
    130.191.X.X, or any IP address using port 1214, we need the data to route
    through the SDSU IP Address.

    NIC Card Info:

    Nic Card 1 (Private Network):

    IP: 192.168.0.1
    Subnet: 255.255.255.0
    Gateway: 192.168.0.1
    DNS: 192.168.0.2

    Nic Card 2 (Cox Network):

    IP: 68.15.25.98
    Subnet: 255.255.252.0
    Gateway: 68.15.25.65
    DNS: 209.242.128.107
    DNS2: 209.242.128.101

    NIC Card 3 (SDSU TNS Network):

    IP: 130.191.73.13
    Subnet: 255.255.255.0
    Gateway: 130.191.73.254
    DNS: 130.191.1.1
    DNS2: 130.191.200.1

    If someone could give us step-by-step instructions to configure this, it
    would be appreciated.

    Stephen

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