VPN Works only in dialup

Hello, I've set up in the office a VPN-Server based on Windows Server 2003 and this server has only one network card configured for 10.0.x.x network with

From outside, there's a dedicated IP adress and all connection requests on dedicated PPTP & L2TP ports are routed by the firewall at VPN Server.

So, if I try to make a VPN connection from a notebook with a dialup connection all works perfectly: i can see all the LAN in which VPN server is....but....If I try to connect from home i've no connection problem (i can see my connection on server logs) but i can see nothing on office LAN

From home I've a ADSL connection and a D-Link DSL 504-Router with this configuration

DHCP from 192.168.0.1 to 192.168.0.253 Subnet 255.255.255.0 Ethernet IP Address 192.168.0.254 Proxy DNS enabled NAT enabled

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This is the ipconfig /all result from home

Configurazione IP di Windows

Host Name . . . . . . . . . . . . . . : xxxxxxxxxx IP Routing enabled. . . . . . . . . : No Proxy WINS enabled . . . . . . . . : No

Home LAN:

Description . . . . . . . . . . . . . : SiS 900-Based PCI Fast EthernetAdapter DHCP enabled. . . . . . . . . . . . : No IP address. . . . . . . . . . . . . : 192.168.0.1 Subnet mask . . . . . . . . . . . . . : 255.255.255.0 Gateway............ . . . . . . . . . : 192.168.0.254 DNS Server . . . . . . . . . . . . . : 85.38.28.70

VPN:

Descrizione . . . . . . . . . . . . . : WAN (PPP/SLIP) Interface DHCP enable. . . . . . . . . . . . : No IP address. . . . . . . . . . . . . : 10.0.51.5 Subnet mask . . . . . . . . . . . . . : 255.255.255.255 Default gateway . . . . . . . . . : 10.0.51.5 DNS Server . . . . . . . . . . . . . : 10.0.10.0 151.99.125.1

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Anyone can help me?

Thanks

Diego.