Date: Thu, 24 Jan 2002 00:13:11 -0500 (EST) From: Alex Pilosov <alex@pilosoft.com> To: Tony Williams <twilliams_62@hotmail.com> Cc: freebsd-net@FreeBSD.ORG Subject: Re: Question on PPPoE Message-ID: <Pine.BSO.4.10.10201240010400.19090-100000@spider.pilosoft.com> In-Reply-To: <F227tI7GZ8gJog7FpqV0000fe59@hotmail.com>
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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 majordomo@FreeBSD.org > with "unsubscribe freebsd-net" in the body of the message > > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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