Understanding the v6 relay agent workflow

[Ted Lemon]

The relay agent options thing in the v4 relay agent is a hack that I  
put in because I didn't want to fully decode the packet there, and in  
particular because relay agent options in v4 are a bit of a hack as  
well - they violate the standard way of packing options in a DHCP  
packet.   I don't know how it's done in the v6 relay because I didn't  
write that code, but hopefully the hack was unnecessary there.