More PPPoE info

[warlord at MIT.EDU (Derek Atkins)]

With PPPoE, you PPP into your ISPs POP in the CO, which gives you an
IP Address of your ISP.  With DHCP, you get an IP Address of the
subnet you are on, which means all customers on the Ethernet segment
need to virtually share a subnet.  I suppose you could create multiple
virtual LANs on the Ethernet, one per ISP, but then the (single) DHCP
server would need to know, by MAC address, which ISP you belonged to.
This means if you change ethernet cards, you would have to contact
your ISP (who would have to contact Bell Atlantic) to get your
information changed in the DHCP server.  If you change your card with
PPPoE, who cares -- authentication is done at the PPP application
level.

-derek

Jerry Callen <jcallen at narsil.com> writes:

> "Kevin P. Lawton" wrote:
> > 
> > I thought this was an interesting bit of info regarding
> > PPP over Ethernet, used by telcos like Bell Atlantic:
> 
> Where did you find this?
> 
> > > PPPoE is a solution for Outsourcing. Telcos are required to open their
> > > networks to other ISPs. With dhcp, it's impossible.
> 
> Why is it "impossible"? I can't see how assigning an IP address via DHCP is
> any different than via PPP. Presumably the difference is that software
> already exists (on the telco/ISP side) for the PPP solution but not for
> the DHCP solution.
> 
> After all, isn't *everything* "just a simple matter of programming"? :-)
> 
> -- Jerry Callen                      Mobile: 617-388-3990
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-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL: http://web.mit.edu/warlord/      PP-ASEL      N1NWH
       warlord at MIT.EDU                        PGP key available
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