Here is the sceneiro:
PC --- 827 --- DSLAM --- 3660
If the 3660 serves as the ip pool, the PC can initialize a PPPoE session to it and get an ip address, using the command 'peer default ip pool pool-name'. However, if the 3660 was configured to direct the DHCP request to a W2K DHCP server, using 'peer default ip dhcp' and 'ip dhcp-server', the PC cannot get an ip. Running debug on 3660 shows that it doesn't send any packet to the DHCP server.
Should I use the command 'ip helper-address' on 827 for the PC to get an ip from the DHCP server?
What's the difference between the mechanism of getting ip address using 'ip helper-address' and 'peer default ip dhcp'?