Router Solicitations

[Niklas Neumann <niklas.neumann@cs.uni-goettingen.de>]

Hello everybody,

I have a question regarding RFC 4861, Section 6.3.7. "Sending Router 
Solicitations". The RFC states that when a host is sending a Router 
Solicitation, "the IP source address is set to either one of the 
interface's unicast addresses or the unspecified address."

So my question is
1) when is a host supposed to set a unicast address and
2) what qualifies as "one of the interface's unicast addresses?"

For example: Is an implementation supposed to remember the last address 
an interface had and to include this address in a Router Solicitation 
after the host attaches to a new link?


Thanks in advance and best regards
  Niklas

--
Niklas Neumann - University of Goettingen, Institute of Informatics
http://user.informatik.uni-goettingen.de/~nneuman1/
Tel: +49 551 39-14419