Media for Cisco ip helper-address

I had pass the 4 CCNA curriculum sessions successfully and i'm not able to do something I think is basic.

I have to forward PPPoE Broadcast packets to my PPPoE server at 10.0.0.2 over my Cisco router.

I use the Cisco 851-K9 router and read on Cisco session 4 that the ip helper-address command forward the Broadcast packets to Unicast IP address.

So I've put in the int Vlan1 the command

ip helper-address 10.0.0.2

and that doesn't work.

I see something about the ip forward-protocol command but I think I missed something.

If someone can help me, It's will be appreciated.

Best Regards

Martin