Date: Wed, 16 Apr 1997 18:47:45 +0800 (WST) From: Adrian Chadd <adrian@obiwan.psinet.net.au> To: Alec Kloss <alec@d2si.com> Cc: Guy Helmer <ghelmer@cs.iastate.edu>, freebsd-questions@FreeBSD.ORG Subject: Re: Subnets of all 0's/all 1's Message-ID: <Pine.BSF.3.95q.970416184133.6511C-100000@obiwan.psinet.net.au> In-Reply-To: <199704151739.MAA25341@d2si.com>
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> each. Now, I realize that my servers (had I more than one) are eating > up a bunch of bandwith talking with each other, so I want to isolate > them on their own network. Say I take all the hosts in the range > xxx.xxx.xxx.64 to xxx.xxx.xxx.95 and set their netmasks to be > 255.255.255.240, 16 networks of 16 hosts each. With proper > configuration, I expect this would work with existing software. > I've already done this :) Well.. At work I have three subnets on the same C-class for three physical networks, all coming together at one point (Fbsd machine w/ 3 ether cards). The ips are 203.62.152.0-31, 203.62.152.32-63 and 203.62.152.64-95. Then I have 203.62.152.96->127 "blank" (its allocated for someone upstairs next month), then I have 128-> 191 for something, and 192->256 subnetted into 8 and 16-IP subnets (for modems). All in all, a very chopped up C-class :) (not that I needed to conserve space, but..) And from the router, its announced to the freebsd gateway box as a single route, ie 203.62.152.0/24 (==netmask 255.255.255.0). > Well, I already use hosts on the "reserved" subnet in the range 1-31 > without any problems. Anyone out there have a definitive answer? > > Also (please don't quote me on this :) isn't the RFCs you quoted from the classful-routing days? Remember now we have classless routing, no more fixed subnet masks. After I tell my cisco's this, they quite happily do what I tell them. Hope this helps, if not tell me and I'll try to explain a tad more (if I'm not grossly mistaken myself..) Adrian
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