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    Problem with ping & tracert


    - laptop A (integrated NIC, Win 7 ultimate x64) IP address: xxx.xxx.0.2

    - laptop B (wireless USB adapter (ipconfig shows that it's working), Win XP pro SP3 x86) IP address: xxx.xxx.0.3

    - both same default gateway: xxx.xxx.0.1, both ping it OK. Both running from same router/hub, both accessing web ok



    but



    - pinging laptop A from B works fine (tho a bit slow) but pinging B from A times out, all 4 packets lost

    - ditto if I replace the USB wireless adapter with an ethernet cable

    - ditto tracert-ing: A from B ok, but B from A times out


    Anyone got any idea why this might be & suggestion for fixing?

    TIA
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    PC B has a firewall on it most likely.
    Adam TT
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    @AdamPI - i guess you were thinking that B's firewall was blocking the pings from A.......? it seems a pretty obvious assumption & i thought "duh! why didn't i think of that", so i tested it & ................

    (both computers have win firewall disabled & AVG Internet security 2012 firewall enabled)

    - With both set at "directly connected to the internet" profile:
    A from B times out
    B from A times out

    - With both set at SOHO (small home or office network) profile:
    A from B times out
    B from A works

    - With both set at "allow all" profile:
    A from B times out
    B from A works

    - With both set at "firewall disabled" profile:
    A from B times out
    B from A works

    - After trying the above I regenerated the configuration of both (it's a function in AVG Internet security 2012 firewall, for anyone not familiar with AVG). This set them both to SOHO & then I tried again & again I got:
    A from B times out
    B from A works

    - tracert:
    A from B times out
    B from A works

    huh! this all seems to be the opposite of what I originally saw, unless I got mixed up!

    anyway, it's still not working both ways, even with the firewall disabled, so i'm still puzzled

    I haven’t tried all the various combinations possible between the two firewall profiles, but I’d guess they should both have the same profile, as they’re both wireless & connected to the same router.......................or have I got that wrong?
    Last edited by jifjaf; March 9th, 2012 at 04:39 PM.
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    Let's put it this way, if you can file share across the two but ping does not work, then it's definitely a firewall. Try using Wireshark to trace the packets and see what's going on.

    On a side note, pc-based firewalls are pretty much worthless if they are only used in a home network with a typical SOHO router at the edge. Not completely for the case of wireless, but nearly.
    Adam TT

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