Cable -> Linksys BEFSR41 -> Wireless D-Link DI-714P+

I need help please. For a few years now, I have been sharing my internet
connection between 3-4 computers at home and setup a home network. It was
pretty simple: Cable connection into a Linksys BEFSR41 (into WAN connection)
and 4 lines getting out of the Linksys. 2 of the connections go to desktop
computers and 2 are used by laptops computers (mine and my wife's). I used
to VPN with my office without any problem.

Recently, I added a wireless router (D-Link DI-714P+). This router is
plugged with one of the former laptop connection coming from the Linksys. I
connect it in the WAN port of the wireless. Here are the settings for both
the Linksys and the D-Link:

Linksys



LAN IP adress : 192.168.1.1

Subnet Mask : 255.255.255.0



Wan connection type : obtain an IP address automatically



DHCP Server: Enable

Starting IP address: 192.168.1.5

Number of DHCP users: 10

DNS 1: 198.235.216.134

DNS 2: 198.235.216.135



At the time of this writing à DHCP Clients à Wireless (router)
192.168.1.5


LapTop1 192.168.1.7



Port range forwarding:



Application: VPN

Ext. port: 723 to 723

Protocol: TCP, UDP

IP address: 192.168.1.102

Enable



Working mode: Gateway

Dynamic routing: Disabled

D-Link (wireless)



WEP: Disabled



Wan: Dynamic IP address At the
time: 192.168.1.5


Gateway: 192.168.1.1

Primary DNS: 0.0.0.0 DNS:
Same as Linksys

Secondary DNS: 0.0.0.0

Renew IP forever



LAN IP address: 192.168.0.1

Subnet mask: 255.255.255.0



DHCP Server: Enabled

IP Pool Starting address: 192.168.0.100

IP Pool Ending address: 192.168.0.199

Lease time: 1 week



At the time of this writing à DHCP Clients à LapTop1
192.168.0.153


PocketPC 192.168.0.146


(just for test purpose)



Virtual server: none enabled

Special application (incoming port): none enabled

No filtering, routing, DMZ



SNMP: Enable (local)

Get community: public

Set community: private

* *
My questions:

With that setup, the internet is working just fine on the LapTop1. A bit
slow (it sometimes seem to be confused and I guess it is, especially since
LapTop1 has 2 different IP adresses?).

The real problem is that I can no longer do VPN connection with my office.
The LapTop1 crashes deeply (it runs Win XP Professional). The VPN
connection seems to connect but LapTop1 cannot find my office LAN.

When I do a change in the Wireless Router (let's say, disable DHCP), I can
no longer get into it to make changes later (192.168.0.1 no longer
responds). I have to do a "hard reset".

Sorry for the long post, but I realy need help.

Thanks.

Do