After you establish the VPN, the client will have two different IP address. That is OK. If you can't access the Internet after establishing the VPN, you may  try to uncheck "Use the default gateway in remote network. This link may help,

routing issues on vpnCan ping VPN server only but not other resources Can't access the internal server when remote client establishes VPN Can't access the Internet while using ...
     http://www.chicagotech.net/routingissuesonvpn.htm  

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 
 >From (http://www.howtonetworking.com/VPN/browsingovervpnc1.htm), it
 says:
 It also could be a routing issue. For example the VPN server and
 client should not use the same IP range

 I understand it as:
 My computer at home is 192.168.1.x

 My VPN Server + computers in office are 192.168.0.1

 When I VPN into the office, my VPN connection is 192.168.0.100

 Am I doing / configuring anything wrong?

 On May 11, 11:16 am, jacky.newsgr...@gmail.com wrote:
 > Hi Robert,
 >
 > I have done all the article suggested:
 > 1) use LMHOST
 > 2) use different ip range
 > 3) net use by IP
 > 4) remove WinXP Firewall
 > 5) enable file and printer sharing
 >
 > I am able to:
 > 1) ping IP address and name (since I have used HOST file)
 > 2) VPN server and all computers under company network
 >
 > Interesting Observation
 > 1) when I connected via VPN, I have no internet connection:- unable to
 > ping to public IP (yahoo.com), unable to surf internet
 >
 > I am still unable:
 > 1) net use via IP or name
 >
 > Wits end.....
 >
 > On May 9, 1:19 pm, "Robert L [MVP - Networking]" <nore...@hotmail.com>
 > wrote:
 >
 >
 >
 > > The XP is not designed as router. In most cases, XP VPN is peer to peer connection except you can make the XP works as router. These search results may help,
 >
 > > Routng how to
 > >       How to Configure Windows 2000 to Be a Router How to display the routing table How to disable ip routing/forwarding on a W2K Pro? How to enable ip ...
 > >      http://www.howtonetworking.com/Networking/routing.htm-Similar pages
 >
 > > How to setup VPN
 > >       To setup a Windows 2000 server for VPN, open Routing and Remote Access ... It is recommend you manually enter the TCP/IP address, DNS and WINS for the LAN ...
 > >      http://www.howtonetworking.com/Windows/vpnsetup.htm-Similar pages
 >
 > > VPN Setup
 > >       To setup a Windows 2000 server for VPN, open Routing and Remote Access console in ... To modify the filters, go to RRAS>IP Routing>General, right-click the ...
 > >      http://www.howtonetworking.com/vpnsetup.htm
 >
 > > Bob Lin, MS-MVP, MCSE & CNE
 > > Networking, Internet, Routing, VPN Troubleshooting onhttp://www.ChicagoTech.net
 > > How to Setup Windows, Network, VPN & Remote Access onhttp://www.HowToNetworking.com <jacky.newsgr...@gmail.com> wrote in messagenews:1178667200.967677.317980@e65g2000hsc.googlegroups.com...
 >
 > >   Hi,
 >
 > >   My SOHO is behind a router, and behind the router is a domain
 > >   controller, etc.
 >
 > >   Using a WinXP Pro box, I am able to setup to accept incoming
 > >   connections (router to allow the necessary ports), and able to connect
 > >   from outside.
 >
 > >   The problem is: from outside, I would like to map to one of the boxes
 > >   (same subnet etc....) but it doesn't allow. And can I enforced Domain
 > >   Controller for the incoming connections?
 >
 > >   Thanks,
 > >   Jacky- Hide quoted text -
 >
 > - Show quoted text -