Mysterious problem on my client's Windows Server 2003 Network

Hi all

I've been troubleshooting a problem a client of mine is having that had
practically disabled the entire network. It was all at random they
would lose connection to the server and/or connection to the internet,
also they started having corrupt pst files while using roaming
profiles. Now, I've since discovered that the problem was actually due
to at least two different things one of which was a rogue router with
the same address as the router they actually use that had DHCP turned
on but DHCP was being handled by the server. However, all the clients
were receiving the proper information for DNS so we couldn't tell until
we entered the IP address of the main router (Linksys) and got a prompt
for a D-Link DI-604. It was obvious after that. Anyway, there is still
corruption going on and people getting disconnected from the server and
losing information. There are no errors anywhere and roaming profiles
have been disabled so that corruption doesn't occur to files being
copied. We've had professionals come in and test the cables and they're
all fine, I installed a new network card in the server though there
wasn't anything to indicate a problem with the first one. Throughout
this process I ran Ethereal a few times and there were always many many
errors about bad checksums from the server to any of the machines that
were trying to transfer information but it wasn't any computer in
particular it was any computer. I want to include that there were many
dropped packets in some cases it was 9500 of 10000 that got dropped but
they were all the ones using smb. So, just a quick recap, from computer
to server no errors from server to computer error. I suspect that's the
server telling the computer that the received data is corrupt. I'm
getting them a new switch for Monday and I've done some performance
monitoring that doesn't look out of place compared to the baseline and
if anything it's lower across the board because of the disabled roaming
profiles.
Anyone have any idea where I should look and what I can do to hunt down
the source of this problem?

Joe

.

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