Lose local network file access when connecting to VPN of a client

Hi,

I am running Windows Vista and am in IT Support.

When connected via a LAN cable I have access to Exchange, network drives etc
and all works peachy. As soon as I connect to a client VPN I lose access to
all my network drives via mapped drives and UNC paths. Funnily my access to
the Exchange server is still perfect.

When I disconnect from the VPN to the client network I gain access to the
network drives again.

I ran an "nslookup" while disconnected from the VPN and only connected to
LAN via network cable and I connect to my company DNS server. Once I connect
to the VPN of the client and run "nslookup" again I connect to the DNS server
of the client. (I can confirm all this as I installed the system at the
client I am connected to via VPN)

So basically it seems that for some reason Vista has some sort of priority
setup to use the default gateway or something of the VPN connection which
takes precedance over my local LAN connection and uses all DNS, WINS etc
settings of the VPN and then I lose access to my data drives as it is on a
DFS share.

The above mentioned problem is also experienced by other people in my team
that runs Vista on their laptops, XP is fine of course.

Concerning my VPN connecion, I ensure that the "Domain" option tick box is
not selected in my VPN connection to the client and only use a username and
password to connect.