From owner-freebsd-questions Mon Dec 10 7:32:55 2001 Delivered-To: freebsd-questions@freebsd.org Received: from wasp.eng.ufl.edu (wasp.eng.ufl.edu [128.227.116.1]) by hub.freebsd.org (Postfix) with ESMTP id 31B5E37B41E for ; Mon, 10 Dec 2001 07:32:45 -0800 (PST) Received: from eng.ufl.edu (scanner.engnet.ufl.edu [128.227.152.221]) by wasp.eng.ufl.edu (8.9.3/8.9.3) with ESMTP id KAA14248; Mon, 10 Dec 2001 10:32:39 -0500 (EST) Message-ID: <3C14D597.FA7C9320@eng.ufl.edu> Date: Mon, 10 Dec 2001 10:32:39 -0500 From: "Robert E. Johnson, P.E." X-Mailer: Mozilla 4.79 [en] (X11; U; Linux 2.2.12 i386) X-Accept-Language: en, eo MIME-Version: 1.0 To: barbish@a1poweruser.com Cc: questions@freebsd.org Subject: Re: internal private IP address standards? Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG > > Date: Sat, 8 Dec 2001 09:52:31 -0500 > From: "Joe & Fhe Barbish" > Subject: internal private IP address standards? > > When setting up a new FBSD box and LAN environment behind it, > what are the rules or standards for selecting the IP address > numbering scheme. I have read unrelated documentation that calls > this the internal IP address scheme or private IP address. > The mandatory requirement is that these IP numbers will never > be seen by the out side world. That being said, I take it that > I can use any IP address numbers I want. > Not any IP address. As already mentioned, there are blocks of addresses reserved for private networks. What you have to watch out for, though, is that some ISPs (particularly large ones, it seems) use private IP numbers internally within their networks, e.g. for their routers and stuff, so you might see some of these supposedly non-routed IP numbers appearing in the data stream from your ISP. You should contact your ISP and ask them what address blocks they have reserved for "link-local" addresses, i.e. what addresses they do not route, so they are guaranteed to never show up on their side of your modem. If they haven't reserved such a block, they don't know what they are doing. - Bob > Thanks > > Joe > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message