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spanning networks

Discussion in 'Networking Issues' started by tweak50, Nov 21, 2005.

  1. tweak50

    tweak50 Network Guru Member

    Okay, heres my problem and sorry if this does not make sense. I have a wrt54gc wireless router, connected to that i have a desktop and two laptops. The internet connection that feeds the router is also a LAN. My problem is that the computers on my router cannot span across the network to access files on the other LAN of the same workgroup. Im not the best with networking so im not sure what the problem is. I have tried setting up static ip address's and that has not worked I have also tried just about everything else. Do i need to set up ip fowarding or something to that nature?
     
  2. DocLarge

    DocLarge Super Moderator Staff Member Member

    How is your router connected to the other LAN? Is the line going to your router's "WAN" port or one of the four "LAN" ports?

    Doc
     
  3. tweak50

    tweak50 Network Guru Member

    through the wan
     
  4. DocLarge

    DocLarge Super Moderator Staff Member Member

    Port forwarding would be the next thing to try if static mapping didn't work...

    Doc
     
  5. 4Access

    4Access Network Guru Member

    Are you purposefully trying to protect the clients connected to the WRT54GC from the computers on the "WAN" side of the WRT54GC?

    If not then simply connect the cable from the "WAN" network to a LAN port on the WRT54GC & disable the DHCP server in the WRT54GC.
     
  6. tweak50

    tweak50 Network Guru Member

    When i did this i lost my internet connection. I could not access the internet nor access any computers. this is what i had tried right away, is there something else that i need to change besides DHCP?
     
  7. virgil

    virgil Network Guru Member

    With this setup:

    existing LAN with internet access
    |
    WAN port
    [WRT54GC]--< wireless clients
    4 LAN ports
    / | | \
    wired clients

    the WRT54GC router uses NAT so all its clients are "invisible" to the existing LAN.

    But you want everyone to be able to see each other and access the internet, so you really don't want to set up your own private LAN - in effect all you need is the wireless AP and 4-port switch functionality of the WRT54GC.

    The caveat here is this opens your existing LAN to security risks from wireless, and all connected clients have to get IP configurations from the existing LAN's DHCP server. I suggest you ask the admin for a static IP so you can still have access to the config menu of the WRT54GC.

    Then on standalone, go to the config menu set up the ff:
    Router IP: Local IP address and subnet mask (static IP given to you)
    DHCP Server: Disabled

    Then save settings, power off the WRT54GC, reconnect this way:

    WAN port
    [WRT54GC]--< wireless clients
    4 LAN ports
    | . | | \
    | . wired clients
    |
    existing LAN with internet access

    and fire away.

    HTH
     
  8. 4Access

    4Access Network Guru Member

    Well then let me ask you this: If take the cable from the existing network, unplug it from the WAN port on the WRT54GC and connect it directly to a computer, can that computer access the internet? It should be able to...

    If so then connecting the cable from the existing network to a LAN port on the WRT54GC and running a 2nd cable to the PC from a LAN port on the WRT54GC should work without problem... (Assuming you remembered to disable the DHCP server in the WRT54GC) See virgil's second diagram. Notice that the existing network is connected to one of the LAN ports, not the WAN port.

    I have a feeling you understand the concepts but were just having problems when setting it up... Checking the output of the 'ipconfig' command during testing can provide useful info.
     
  9. cbetta

    cbetta Guest

    Did that, done that, what now

    Hi, I had the same problem as described above and did as tolled. But now I can not reach my router anymore. I just can not figure out what the IP adres is of it at the moment. Please help me here.
     

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