RRAS and DHCP in windows 2003 server

I have windows 2003 server with 2 NIC – 1 going to the LAN (10.0.0.10) and second to WAN (I have dedicated IP – 82.x.x.x).

I enabled on the server RRAS, now when I go to the client, and configure the IP on the client-workstation manually (meaning giving to workstation ip 10.0.0.1, and as dns&gateway I write 10.0.0.10) – all is working very well.

But I want to use DHCP.
While using RRAS, the DHCP server service is being ignored. When I use the DHCP of the RRAS (RRAS -> NAT/Basic Firewall -> Properties -> Address Assignment) and I write in the IP address – 10.0.0.10 & MASK 255.255.255.0 -> the client is getting IP with dns&gatewat configuration as I want (10.0.0.10) but cannot browse the internet (even ping is not working)

You have any idea ?