Computes with 2NICs on 2 separate networks

Discussion in 'Networking Issues' started by WirelessInn, Nov 15, 2006.

  1. WirelessInn

    WirelessInn LI Guru Member

    I very much appreciate all the help I receive from consulting these forums.
    I am attaching a schematic outlining my current situation and what I a trying to do.
    I have 2 buildings:
    1 - BLDG A housing my HughesNet Satellite Connection/Modem, WRT54G router and wirelessly connected HomeOfficeComputers ("HOC"). The Sat Modem provides DHCP. IP Adresses in that network are
    2 - BLDG C housing my company's main business computers: MainOfficeComputer ("MOC"), LANed to 3 POSale computers via hub out of NIC#1. No DHCP. Addresses are
    I have successfully (thanks to LinksysInfo expert HennieM) set up a bridge between BLDG A and BLDG C to allow MOC access to the Satellite Internet Connection via a second NIC - NIC#2). I wanted to keep the POSale LAN separate from the Satellite Internet network out of BLDG A. It all works very well indeed.
    Now, I want to ad a SubMainOfficeComputer ("SOC"), have it LANed to MOC via NIC #A - address I also want it to connect to the Internet via the Satellite Connection. I want to again use a second NIC in SOC - NIC#B / address to allow for that without infringing upon the existing POSale LAN. So, I plan to insert a SWITCH/HUB (which one would be better?) at location (*) and connect NIC#B to it. f course, if that is all a working proposition!
    Any comments: I'll appreciate!
    - Roger T

    Attached Files:

  2. HennieM

    HennieM Network Guru Member

    Easy on the "expert" bussiness Roger... what I helped you do was just fairly basic networking.

    Your setup as in the schematic looks good. You would setup SOC near-identical to MOC, with just the different IP addresses.

    A hub and switch do the same job, so it does not matter what you use at *. A switch is better though, as it does not broadcast all its info to all connected devices, and is thus a bit more secure. I think a switch might be faster as well, but speeds will differ from vendor to vendor anyway.

    As with MOC, be sure NOT to enable routing on SOC.
  3. WirelessInn

    WirelessInn LI Guru Member

    Well, HennieM, it's just thaqt you are very articulate and clear in providing information.
    I just wanted confirmation re: my additional project. MOC could not host our new check processing equipment, apparently since our POSale network uses MS SQL server already, and that the check processing system would also do so. Installer said that conflict(s) would occur.
    I had planned to get a second office computer anyhow.
    Thanks again!
    - Roger T
  4. WirelessInn

    WirelessInn LI Guru Member

    All in all, I am amazed at the broadcast radius of a simple WRT54G. I have a B&B and it reaches all our Guests and the wireless bridge to another commercial building within a 150 ft radius - buildings, second floors included. Of course, using just a sundry wireless router to provide "hotspot" service is not the best way to go. Neither is Satellite Internet I suppose. Also, Guests have started asking about VPN access - I knew they would! I understand that neither such a router as a stock WRT54G, or Satellite B'Band for that matter, are ready to provide such access. Here I go again: make a perfectly well working scheme... better! Any preliminary opinion? Perhaps I should go to another area of this forum?
    - Roger T
  5. ifican

    ifican Network Guru Member

    Vpn connectivity should work fine from the inside out for vpn clients on their machines. However this is only going to be limited to 1 user at a time and 1 user per session timeout. (The vpn connection after it has closed needs to timeout in the router before another user can connect.) I guess there is no easy way to approach that with guest unless you just tell them, no. The smart ones will figure it out, but the last thing you want to do it tell them yes or maybe and have 1 user open a session and leave it up for the duration of there stay and then no one else can get connected.
  6. HennieM

    HennieM Network Guru Member

    If I remember correctly, your Linksys devices do not control your internet connection, but your satellite modem does. If so, your satmodem would actually determine whether you could have none, one, or more VPN connections going out.

    The thing usually boycotting VPN is the Network Address Translation (NAT) going on when you connect a private IP net (such as to the public IP net. The NAT screws up the integrity of the VPN.

    So, you might look for something such as "VPN passthrough" in your modem's setup. If you find something like that, you could enable it, and then might be able to have one or more VPNs going out - check the satmodem's manual.

    As ifican mentioned, the VPN connection must be setup on the client's PC - the passthrough enabled on the satmodem would just facilitate passing such a connection out to the internet, it does not provide the VPN.
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