WRT54G Wireless can connect to internet, Cannot connect to Local LAN PCs

Discussion in 'Networking Issues' started by Aquafire, May 2, 2007.

  1. Aquafire

    Aquafire LI Guru Member

    Hello All,

    I have a HP Pavilion Dv1000, running Windows XP SP2. The built in wireless card is "Intel PRO/BG 2200 Wireless LAN Adapter" with the latest Intel Drivers I just bought Linksys router WRT54G VER 7 to share my Cable Internet connection. The WRT54G is running 802.11g 54Mbps mode and has the “Standard Original Firmware’†(since third party firmware cannot be applied to WRT54G Ver 7.x)

    Existing Wired Configuration:

    My Cable Internet Net provider is running a Microsoft I.S.A. Proxy Server on his side (which runs NTLM based authentication, which the Internet Explore and FireFox support). A usual CAT-5 Ethernet wire from a standard Ethernet switch is running to my home, which I used to connect to my Laptop Ethernet port. So in network topology, my cable net provider is running a really big LAN over the entire neighborhood area.

    My existing configuration is as follows

    Outside Switch===wired connection====>Laptop (Connection info below);

    1. IP Address allocated to my laptop using DHCP. The range of IP Address allocated starts from 172.16.x.x

    2. Subnet is of the order

    3. I have given the HOST NAME and WORKGROUP name as advised by Cable Internet Provider.

    4. The DNS, Proxy Server and Gateway (automatically configured by DHCP) is In the Web Browsers settings I have mentioned the same address for all the services and protocols , e.g FTP, HTTPS, GOPHER etc.

    The web browsing and all other application including Instant Messaging application were working fine (Yahoo/Microsoft Messengers), where I have given the same proxy settings.

    At the same time I can also browse my Local Area Network (LAN) in the Network Neighborhood and see all other computers connected in the same/other switches who use the same Cable Internet Service as I do, and I can access the Shared directories and files over the LAN.

    My Wire LESS Configuration (Dilemma)

    Outside Switch==wired connection==>WRT54G==wireless==>Laptop

    In the WRT54G configuration web interface, I did select ;

    1. DHCP as the configuration mode. (On the first Basic configuration page)

    2. I configured only Host Name / Workgroup Name (to the same which my laptop had existing in the local area connection and network settings, since I am assuming that now the router would be talking to the ISA Proxy server).

    3. Changed the SSID to a unique name of my own home network.

    4. Rest of the settings are left to factory defaults, which means there is no security and encryption mode enabled WEP or WPA(1 or 2), just to make it simple.

    5. Router address is default with Subnet

    6. DHCP is enable for Clients connecting to the router. The default range starts from . Maximum DCHP Users are 40. All other fields left blank or to the value they have by default.

    7. In the Advanced Routing Tab the default option is “Gatewayâ€. All other fields left blank or to the value they have by default.

    8. Router is connected and ready to accept connections now. In the “Status†page of the router Web Based Interface the Router itself now has the following connection to my Cable Internet LAN ;

    Login Type: Automatic Configuration - DHCP
    IP Address:
    Subnet Mask:
    Default Gateway:
    DNS 1:
    DNS 2:
    DNS 3:
    MTU: 1500

    9. My Laptop now connected in WIRELESS mode to the WRTG54G gets the following configuration in the same DHCP mode (nothing is altered in the wired or wireless connection modes on the laptop, they are in the same and default DHCP mode). The Status of the WIRELESS connection Icon now shows ;

    Address Type: Assigned by DHCP (which is the router now)
    IP Address : (one laptop so the first address from the IP Pool)
    Subnet Mask :
    Gateway : (The WRT54G router itself)
    DHCP : (The WRT54G router itself)
    DNS : (The WRT54G router itself)

    10. The Web Browser’s settings on the laptop are still the same. That is Proxy server is and Port 8080 (as they were originally configured for the Cable Internet connection). Web browsing and all other internet based application still working fine.

    My only question is , I cannot access my local LAN computers through the Network Neighborhood anymore. That is I cannot access the shared files and folders on other users computer in the LAN when connected in the wireless mode. When given the name of a local network computer in the form \\xyzcomputer , the network neigbourhood cannot find any host.

    Any help or configuration tips would be highly appreciated so that I can still use the internet (via proxy server) and browse the Network Neighbourhood computers too.

    Best Regards,
  2. slam5

    slam5 LI Guru Member

    Can you make sure the AP isolation is turned OFF? I think it is under wireless->advance, if it is checked, no wireless client can access the lan side of the router. I have a wrt54gs v2.1 and that exists. I am almost sure that exists on the wrt54g too. God Bless!

  3. Aquafire

    Aquafire LI Guru Member

    Well AP Isolation is Turned OFF by default and it is still in the OFF mode. I did check it earlier as well. But thats doesn't make a difference.

    I believe it has got something to do with the IP addressing scheme of my Cable Internet Provider (which is 172.16.x.x) and the WRT54G router (which assigns 192.168.1 to all clients connecting). The sub-netting also needs to be checked.

    I believe I may have to give fix IP to the router and/or my laptop in the Wireless mode in order to correspond with the IP addressing of the Cable Internet Provider. This way router would behave as a bridge between my home wireless network and the local neighborhood network of my Cable internet provider, using whose proxy I connect to the internet. Anyways these are just vague ideas.

    Having said all this...the problem is this I dont have a clue how to set it all up and proceed, since I am not an expert in IP Addressing/Network Infrastructure. :biggrin:

    Anyways any more ideas would be surely welcome

  4. slam5

    slam5 LI Guru Member

    can you ping

    hi, can ping the other clients? why don't you try this? create a network share on machine, let say the network share is c: of machine and call it c-drive. try to resolve it by \\machine-toshare\c-share. can you see the other machine after that?
  5. slam5

    slam5 LI Guru Member

    why don't you return the router back to the default settings? it may be all the customizations that that is causing the problems.
  6. Aquafire

    Aquafire LI Guru Member

    Well infact I dont have any other machines on the wireless network. At the moment I have only one laptop of mine at home and the wireless router.

    As far as pinging the other machines which would be connected to the wireless router with the IP scheme 192.168.x.x (which the router assigns from its DHCP pool) is concerned, I know it would work any ways, since the subnet of all the machines would be the same.

    The problem is to get to the other side of the Wirless Router, which is the Neighbourhood LAN network of the Cable Internet. This network addressing is 172.16.x.x which is usually assigned to my laptop as well if I connect thru the WIRED network, that is simply plugging the CAT5 Ethernet wire directly to my laptop and eliminating the router from in between.

    The router now itself pulls the IP address of 172.16.x.x for itself since the Cable Intertnet is now plugged in the WAN port of the router. It needs to BRIDGES the wireless LAN created by itself and the network to which it is connected, so I can see the neighbourhood PC by browsing the LAN. It however lets me connect to the INTERNET by using the same proxy which I use when having a WIRED connection, so actually the way to connect to the Internet has not changed. Only the ability to browse the Local Area Network at the same is now disabled.

    Hope I am able to describe the actual scenario at my side. Thanks for the active thoughts anyways, hope any more clues would come by.

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