Date: 11 Jan 2002 11:47:24 -0800 From: swear@blarg.net (Gary W. Swearingen) To: elitetek@tekrealm.net Cc: Dan Langille <dan@langille.org>, fabrizio.fresco@netsiel.it, freebsd-questions@FreeBSD.ORG Subject: Re: routing with PPPoE/DSL on a dual homed gateway Message-ID: <uok7uozn3n.7uo@localhost.localdomain> In-Reply-To: <20020110182453.A70804@freebsd.tekrealm.net> References: <3C3DF24A.21937.6E5B5ED@localhost> <2953.213.155.199.202.1010714973.webmail@webmail.cww.telecomitalia.it> <3C3DF7C0.26594.6FB0D2C@localhost> <20020110182453.A70804@freebsd.tekrealm.net>
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Andrew Stuart <elitetek@tekrealm.net> writes: > pppoe is not a regular ethernet connection, it is a special protocol. More to the point, the NIC-to-modem connection, while still a regular Ethernet connection, using regular Ethernet protocol, links your PPPoE software (via tun0 and NIC) to your ISP's PPPoE software to carry the TCP/IP protocol which normally rides directly within the Ethernet protocol. There's no IP address to be configured for the NIC-to-modem connection, because neither knows about Internet Protocol in this use. I suspect that "your ISP's PPPoE software" is in both your modem and at their facilities, but I suppose they could use some other protocol (like PPPoATM or a custom thing) between the modem and their systems. Or, I suppose they could have the modem-to-ISP thing set up as an Ethernet bridge so there seems to be an Ethernet cable between your NIC and your ISP's NIC and have all their PPPoE stuff at their place. (I don't know if PPPoE actually encapsulates TCP/IP data within PPPoE data or just setups the connection and then gets out of the way and uses pure TCP/IP until the connection is stopped via a time-out mechanism after any part of the PPPoE system is stopped.) That's my guessing, anyway; I'm also no expert (as if it's not obvious). To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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