Two machines on router can access internet but not each other

Discussion in 'Wireless Networking' started by Jethro, Apr 28, 2008.

  1. Jethro

    Jethro Guest

    Hoping someone can shed some light on this weird problem.

    I have a wireless router (
    ). It is connected to my cable modem, and has been configured to
    "spoof" the network card the modem was originally configured to. It
    has been set to act as a DHCP server, and to assign IP addresses -

    Machine A is wired into it, and I have told the router to always
    assign it's MAC an IP address of This machine can access
    the internet no problem. Both in windows and ubuntu, the network
    interface has been set to "automactically obtain IP address".

    Machine B is wireless connected. It is being assigned an IP address of (which I find suspicous. What happened to ?)
    It too can happily access the internet.

    So what can't machine A ping machine B, or machine B ping machine A ?

    On both machines, after an unsuccessful ping, "ARP - A" shows the MAC
    address of the other machine.

    I tried running "Wireshark" under ubuntu to see what was happening,
    but not being a network guru didn't really understand it.

    The most annoying thing is that I've previously had 3 machines happily
    connecting to each other, both wired and wireless. So something has

    I'm convinced something is cached in my router (which is why it
    insists on passing out .99 as the first assigned IP address). But I've
    tried restoring the factory defaults, and it's still not working.

    Can anyone suggest how to fix this please ?
    Jethro, Apr 28, 2008
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  2. Jethro

    James Egan Guest

    Since both can connect to the Internet okay it's not a wireless issue.

    Presumably the subnet mask is set to

    Ensure ICMP packets support is enabled in the router.

    Ensure ICMP packets are not blocked by firewalls.

    What do the routing tables say?

    James Egan, Apr 28, 2008
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  3. Hi
    Does your Router supports static IP within the DHCP?
    In most Routers if you want a computer to get the same IP with every log on
    you have to assign a Static IP that is out of the DHCP range.
    Jack (MVP-Networking).
    Jack \(MVP-Networking\)., Apr 28, 2008
  4. Jethro

    MaKiN_BaCoN Guest

    Go into add and remove windows components and see if your network service and
    other network files and printer are both checked, because that was the
    problem when I couldn’t connect.
    MaKiN_BaCoN, Apr 28, 2008
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