router can ping yahoo.com, computer cannot

Discussion in 'Wireless Networks' started by John Smith, Jan 8, 2007.

  1. John Smith

    John Smith Guest

    I have a linksys wrt54g wireless router. If I log on to the router
    and use the ping option on the administration/diagnosis page to
    ping yahoo.com, no problem is encountered. If I do it from the
    command window of the computer (only one computer is connected to
    the router), I cannot ping anything, not even dns, except the
    router itself.

    From router's web page, I can traceroute to yahoo.com. From the
    command window, traceroute to yahoo.com or dns stops after the
    router, i.e. it shows the first connection to the wrt54g router,
    the rest is "request time out".

    Where is the problem? The router has internet connection and my
    computer can access the router. It looks like the router is
    blocking my computer's access to the internet, hence,
    configuration problem. Is this a correct assumption?

    My wrt54g is connected to a befsx41 router. Since all the devices
    connected to the befsx41 (including the wrt54g) have internet
    access, I believe that part is OK.

    I have spoken to two Linksys' technicians. They all wanted me to
    disable the wrt54g's DHCP server function. But routers are
    supposed to forward packets, right? Even though befsx41's IP
    starts with 105 and wrt54g's starts with 108, the connection
    should still work.
     
    John Smith, Jan 8, 2007
    #1
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  2. John Smith

    John Smith Guest

    Here is the info (the computer connected to wrt54g):

    DHCP enabled: yes
    Autoconfiguration enabled: yes
    IP address: 108.157.231.100
    Subnet mask: 255.255.255.0
    Default Gateway: 108.157.231.126 (this is router's IP)
    DHCP server: 108.157.231.126 (router is also the DHCP server)
    DNS: 24.25.5.150 & 24.25.5.149

    This is router's info:

    IP address: 105.34.67.103
    Subnet mask: 255.255.255.0
    Default gateway: 105.34.67.98 (this is the of the router the
    wrt54g is connected to)
    DNS1: 24.25.5.150
    DNS2: 24.25.5.149
    DHCP server starting IP address: 108.157.231.100
    maximum number of DHCP users: 10
     
    John Smith, Jan 8, 2007
    #2
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  3. John Smith

    John Smith Guest

    In my original post, I did say the wrt54g is connected to a
    befsx41. Anyway, the lan configuraton is this:

    cable modem -> befsx41 (with two computers and a switch which has
    two other computers connected to it. They work fine for quite a
    few years now.) -> wrt54g (with a laptop, which is having problem).

    I could eliminate the befsx41 and use only the wrt54g. Since I'm
    not sure how secure the wireless router is, I only turn it on when
    needed and turn it off when not needed. (a google search on "crack
    wep" gives 72,000 hits.)

    I assign the befsx41 an IP address of 105.34.67.98 and this is the
    gateway that is shown on the wrt54g. This shows that the wrt54g
    can communicate with befsx41 with no problem. Since the wrt54g can
    ping yahoo.com, its configuration should have no problem.

    Routers are designed to exchange packets between networks and I
    deliberately set up the two routers so they are on two different
    logical networks, thinking that if someone breaks into my wireless
    router, he won't have a free ride to all my computers.
     
    John Smith, Jan 8, 2007
    #3
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