Multiple reasons: a) MAC addresses can be spoofed. (and are only 48 bit long). Session ID is 64 bit.
b) A real reason is that you can have multiple PPPoE sessions to different ISPs from same MAC addr.m -alex On Thu, 24 Jan 2002, Tony Williams wrote: > > Hi, > > I have a question regarding PPPoE protocol and code. I recently > changed from dial up to a PPPoE service through a DSL provider > and was successful in setting the FreeBSD 4.2 box up! > > Out of curiousity, I went through some of the code in netgraph and > the rfc specification, but unable to follow the necessity for the > Session ID. the protocol says the peer mac address and the session > id determines a unique session. From one peer, one can have only one > internet connection and mac addresses are unique. Why then the session > id also included in the protocol. What is the advantage of having > session id, it is not there in normal dial up PPP and who uses it? > > In my case, the ISP did not mention anything about the session id > and I have only one session from the PC, i assume > > Thanks > -Tony > > > _________________________________________________________________ > Chat with friends online, try MSN Messenger: http://messenger.msn.com > > > To Unsubscribe: send mail to [EMAIL PROTECTED] > with "unsubscribe freebsd-net" in the body of the message > > To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-net" in the body of the message
