Date: Tue, 16 May 2006 19:20:30 -0600 From: Kim Shrier <kim@tinker.com> To: Unix-Solutions - Steven <steven@unix-solutions.be> Cc: freebsd-net@freebsd.org Subject: Re: /31 on 2 interfaces Message-ID: <DF6D4C18-F116-4ABD-AE7A-A1AC5266D660@tinker.com> In-Reply-To: <20060517010927.GA656@gremlin.foo.is> References: <001301c67946$604b7f70$aa00000a@cloe> <20060517005546.GJ65555@funkthat.com> <20060517010927.GA656@gremlin.foo.is>
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A /31 is not a point-to-point link. A /32 is. A /31 is a network with nothing but a loopback and broadcast address. You have to go to a /30 to have a block of addresses that is useful or configure a point-to-point link where you specify the address at each end of the link. Kim On May 16, 2006, at 7:09 PM, Baldur Gislason wrote: > /31 is common practice today. You don't need broadcast on a point- > to-point link. > The only broadcast you need is ARP and that's on layer 2. > > Baldur > > On Tue, May 16, 2006 at 05:55:46PM -0700, John-Mark Gurney wrote: >> Unix-Solutions - Steven wrote this message on Wed, May 17, 2006 at >> 02:10 +0200: >>> I have 2 servers with both 2x 'em' interfaces in it. >>> I configged a /31 on both interfaces >>> em0 in box 1 = 10.0.0.1 >>> em0 in box 2 = 10.0.0.2 >> >> As someone else mentioned even if you did a /31, those addresses >> aren't >> on the same network... >> 254 & 1 == 0 >> 254 & 2 == 2 >> >> Hence different networks.. the other thing is that you can't have >> a /31 >> due to the fact that one ip w/ all the node bits set is the broadcast >> for the network causing other sorts of troubles... the smallest >> usable >> network is a /30... >> >> -- >> John-Mark Gurney Voice: +1 415 225 5579 >> >> "All that I will do, has been done, All that I have, has not." >> _______________________________________________ >> freebsd-net@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-net >> To unsubscribe, send any mail to "freebsd-net- >> unsubscribe@freebsd.org" >> > > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" > -- Kim Shrier - principal, Shrier and Deihl - mailto:kim@tinker.com Remote Unix Network Admin, Security, Internet Software Development Tinker Internet Services - Superior FreeBSD-based Web Hosting http://www.tinker.com/
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