Pnly some computers can see each other; all can connect to interne

[Guest]

Long story short, I have 3 computers hooked up to a wireless router:

Computer A: desktop PC running XP
Computer B: desktop PC running XP
Computer C: MacBook Pro running OS X 10.latest

Netgear Wireless Router model WGR614 v6
Comcast Cable

Network is connected cable -> router -> computers

I have internet connectivity on all three computers

Checking the router's attached devices from the utility homepage
(192.168.1.1), I can see three computers are connected to the network.
However one of the computers, Computer A, has no Device Name assigned to it,
even though I had run Network Setup Utility on it, and it has a corresponding
IP and MAC Address (IP verified on the computer through ipconfig).

So, here's what happens:

Computer C can browse Computer B. Computer B is apparently aware of Computer
C, but I futzed something up, so I can't browse my Mac (although at one time
I did do this).

But that's not the main problem. The main problem is computer A can't
communicate with Computer B or Computer C in either direction.

What makes it weirder is that using ping, I've found that Computer A can
ping Computer B and Computer C, but not itself!!? Computer B can see itself
and Computer C. Computer C can see itself and Computer B.

In otherwords, Computer A cannot be pinged by anyone, including itself, but
Computers B & C can be pinged by everyone, including Computer A.

Is this making any sense? Because I can't even begin to figure out where the
problem lay.

 

[Steve Winograd [MVP]]

Long story short, I have 3 computers hooked up to a wireless router:

Computer A: desktop PC running XP
Computer B: desktop PC running XP
Computer C: MacBook Pro running OS X 10.latest

Netgear Wireless Router model WGR614 v6
Comcast Cable

Network is connected cable -> router -> computers

I have internet connectivity on all three computers

Checking the router's attached devices from the utility homepage
(192.168.1.1), I can see three computers are connected to the network.
However one of the computers, Computer A, has no Device Name assigned to it,
even though I had run Network Setup Utility on it, and it has a corresponding
IP and MAC Address (IP verified on the computer through ipconfig).

So, here's what happens:

Computer C can browse Computer B. Computer B is apparently aware of Computer
C, but I futzed something up, so I can't browse my Mac (although at one time
I did do this).

But that's not the main problem. The main problem is computer A can't
communicate with Computer B or Computer C in either direction.

What makes it weirder is that using ping, I've found that Computer A can
ping Computer B and Computer C, but not itself!!? Computer B can see itself
and Computer C. Computer C can see itself and Computer B.

In otherwords, Computer A cannot be pinged by anyone, including itself, but
Computers B & C can be pinged by everyone, including Computer A.

Is this making any sense? Because I can't even begin to figure out where the
problem lay.

When a computer can't ping itself, the problems is probably caused by
a firewall program on that computer, such as ZoneAlarm, that's
improperly installed or partially (but not completely) uninstalled.
--
Best Wishes,
Steve Winograd, MS-MVP (Windows Networking)

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