Ping failures.

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Hi,
I appreciate that I am not giving you much to go on, but I have a
networking problem.

I have a Sony Vaio Laptop, a 3Com OfficeConnect Hub and a Dell PE 2800
server.
Laptop is Win XP Pro, Server is Windows Server 2003.

The Server has an embedded Intel 10/100/1000 NIC as standard.


Now, the problem is that I get intermittent ping responses from the
server.
This is not a broken cable issue.

If I set up a 'ping -t 192.168.1.100' in a command prompt on the
laptop, then I might see successful ping responses from the server.
The IP address just mentioned is the IP of the server.

Now, if I unplug the Cat 5 cable from the laptop, the ping response
changes to 'Hardware Error' and eventually changes to 'Destination
unreachable'

Now, If I plug the network cable back in, I SOMETIMES start to receive
ping responses after a few seconds, but most often the laptop will
keep responding with 'request timedout'.

After a few minutes of seeing 'request timedout' the laptop might
suddenly get a good reply to the ping.

So, I can't work out what is wrong with this?

Why would the server respond OK sometimes and not others?

Just as a further test, I can also plug in another PC into the hub,
and this same ping test succeeds every time to that piece of kit. I am
inclined to believe that there is something wrong with the NIC on the
server, but I need more advice.

Also, in the full network setup. If I plug in a hardware firewall into
the hub, and have lots of PCs connecting through the firewall, they
all ping the server OK everytime!!!

I don't understand enough about this problem.

Any help appreciated!


Regards
.

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