L2TP/IPSEC over PPPOE

Excuse me.
Ive tried a lot. but can not succeed.
I am using PPPOE to surf the internet.
And I want all my connection through another VPN server.
Could anyone give me a sample?
Thanks a lot.


PPPOE account:
USER: pppoeuser
PW: pppoepw

VPN account (L2TP/IPSEC):
IP: 123.123.123.123
USER: vpnuser
PW: vpnpw
IPSEC KEY: ipseckey