From owner-freebsd-isp Fri Nov 13 06:00:22 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id GAA08212 for freebsd-isp-outgoing; Fri, 13 Nov 1998 06:00:22 -0800 (PST) (envelope-from owner-freebsd-isp@FreeBSD.ORG) Received: from magicnet.magicnet.net (magicnet.magicnet.net [204.96.116.9]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id GAA08152 for ; Fri, 13 Nov 1998 06:00:20 -0800 (PST) (envelope-from bill@bilver.magicnet.net) Received: (from root@localhost) by magicnet.magicnet.net (8.8.6/8.8.8) with UUCP id IAA05405 for freebsd-isp@freebsd.org; Fri, 13 Nov 1998 08:55:02 -0500 (EST) Received: (from bill@localhost) by bilver.magicnet.net (8.9.1/8.9.1) id IAA28224 for freebsd-isp@freebsd.org; Fri, 13 Nov 1998 08:54:33 -0500 (EST) From: Bill Vermillion Message-Id: <199811131354.IAA28224@bilver.magicnet.net> Subject: Re: two routers back to back: Do they need real ip-adresses? In-Reply-To: <199811130430.UAA22947@kjsl.com> from Javier Henderson at "Nov 12, 98 08:30:40 pm" To: freebsd-isp@FreeBSD.ORG Date: Fri, 13 Nov 1998 08:54:33 -0500 (EST) X-Mailer: ELM [version 2.4ME+ PL38 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-isp@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Javier Henderson recently said: > Bill Vermillion writes: > > As long as both routers know about the other and it is an > > ethernet connection - just hook them together. I did that in > > the process of moving 4 C's from one provider to another. It > > made it convenient and then I could upgrade the IOS on the > > first. ... > > > Our uplink isp wants us to subnet one of our C's in a /30, is > > > this really nessecary? > > That's typically the address of the serial port. A /30 gives a > > four address range. The network number, 2 IPS, and a broadcast > > number. The ones I've seen have the ISP as the lower of the two > > addresses and the client as the upper of the two. These normally > > are not part of your address space. > The above is correct, though your ISP probably wants you to > use numbered links so packets generated by either router have an IP > source address of the interface from which they are leaving the > router. This can help troubleshoot certain network problems. The two different providers I used - had to move because our first couldn't supply needed bandwidth for a contract we got - all use the /30 method. It always seemed logical to me - as that was the first way I had ever seen it or used it. I've taken the top end of one of our C's, and broken it up into groups of 4 so I can route addresses out through the serial ports for remote services. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message