Date: Fri, 13 Nov 1998 12:07:03 +0100 (CET) From: N <niels@bakker.net> To: freebsd-isp@FreeBSD.ORG Subject: Re: two routers back to back: Do they need real ip-adresses? Message-ID: <981113120350.30188B-100000@liquid.tpb.net> In-Reply-To: <19981113090526.A10967@skriver.dk>
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>> 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? > You can't use unnumbered on broadcast media aka ethernet, so you need to > assign addresses to the interfaces, but these can be RFC1918 addresses, > that is if your ISP is willing to accept this. You shouldn't use private addresses either, this will break Path MTU Discovery if any filters exist between a client and your network. Ripping four addresses from your /24 shouldn't pose much of a problem. Turn off proxy-arp on the Ethernet interface where that /24 is attached to and you have the added benefit of people not being able to access those IP addresses directly. -- Niels. -- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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