Date: Fri, 13 Nov 1998 06:41:21 +0100 (CET) From: Leif Neland <root@swimsuit.internet.dk> To: Javier Henderson <javier@kjsl.com> Cc: Bill Vermillion <bill@bilver.magicnet.net>, freebsd-isp@FreeBSD.ORG Subject: Re: two routers back to back: Do they need real ip-adresses? Message-ID: <Pine.BSF.4.05.9811130634050.5275-100000@gina.swimsuit.internet.dk> In-Reply-To: <199811130430.UAA22947@kjsl.com>
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On Thu, 12 Nov 1998, Javier Henderson wrote: > Bill Vermillion writes: > > Leif Neland recently said: > > > We had to put in a cisco 1605 router (with 2 ethernet ports) between our > > > net and our isp supplying our backbone connection. > > > > > The "ethernet", which is only a crossed 10BT cable between the two > > > routers, does it need real ip adresses? > > > > > > > > > +-----------+ +-----------+ +----+ ----- > > > --our net---+ E0 E1 +------+ E0 S0 |-----+ | \ > > > 3C's | 1605 | | 100x | | +---- > > > +-----------+ ^ +-----------+ +----+ > > > | > > > Can I use 192.168.1.0-adresses here? > > > Or even unnumbered ip? > > > > 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. > > I'm trying to understand why you want the 1605 in place. Can't > you just connect "our net of 3C's" to Ethernet 0 on the first > router (the one with Serial0 connectd to your ISP)? > Because the 100x belongs to our ISP, and can't always handle the job of routing between our 3 C's. Sometimes it routes stuff from one C to another trough S0 up to their central router where it comes back. We have customers with fixed ip's calling in on different portmasters, and the 100x can't handle ospf-routing when it also has to handle the in/outgoing traffic. We also later will need S0 to go elsewhere. > > > 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. Can I use 192.168-adresses? Leif Neland To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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