Can ping windows 2K wireless host, not XP, from Vista (same subnet

[Guest]

I have a home LAN using a netgear wireless router (WPN 824). I also have:

A laptop running Windows 2000 with a Centrino wireless chipset, address via
DHCP
A desktop running Windows XP Pro (firewall disabled) running Netgear PCI
Wireless card (WPN511), address via DHCP
A new Vista machine (firewall disabled, network configured as "private")
running Netgear USB Wireless (WPN111), address via DHCP
A desktop machine running XP Pro connected via 100 Mbit Ethernet, to the WPN
824, static address

All are on the same LAN (192.168.3.0/24). The wireless router is addressed
192.168.3.1 and is the gateway to the internet, and the DHCP server. All
machines can access the internet through the WPN 824. The machines running
windows XP and Windows 2000 can all ping each other and share files. The
machine running Vista can only ping the Windows 2000 machine, and can only be
pinged by the Windows 2000 machine.

When I attempt to ping one of the other (XP) wireless nodes on the network,
from the Vista machine, I can see that the ARP is successful (because the IP
address and appropriate MAC address are viewable in the Vista ARP cache after
an attempt at pinging, and the Vista machines MAC address is visable in the
ARP cache of the XP machine). However, the echo requests (or replies)
themselves time out, no matter which side (XP or Vista) initiates the ping
process.

Why is it that I can pass traffic between the XP machines and the Win2K
machine, and between the Win2K machine and the Vista machine, but not the
Vista machine and the XP machines?

Please help. I have also tried installing the LLDT for the XP machines.
Doing so has not improved the situation (can't imagine why I'd need LLDT to
ping, anyway). I'm an experienced network-guy (it's part of what I do for a
living), but am totally new to Vista. Perhaps this is one of those unusual
Vista Bugs?

Please help,

Aaron

 

[Guest]

Update. I can ping the wired XP host (never tried that before), but not the
wireless XP host. So now I'm down to one machine (XP wireless) that can talk
to everything but my Vista wireless host. All other machines appear to be
working just fine.

Any assistance would be appreciated.

 

[Robert L [MVP - Networking]]

If turn off the firewall on wireless XP, can you ping it by IP?

Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
Update. I can ping the wired XP host (never tried that before), but not the
wireless XP host. So now I'm down to one machine (XP wireless) that can talk
to everything but my Vista wireless host. All other machines appear to be
working just fine.

Any assistance would be appreciated.

 

[Guest]

All machines have the firewall turned off (wireless XP included). I cannot
ping it by IP. If the ARP cache is cleared (on the Vista machine), the ping
will generate and ARP request/response, and I will see the wireless XP's
MAC/IP tuplet in the Vista machines ARP cache. Even though the ARP seems to
work, the pings still time out.