Date: Thu, 27 May 1999 13:25:17 -0700 From: "David Schwartz" <davids@webmaster.com> To: "Jasper O'Malley" <jooji@webnology.com>, "Dan Langille" <junkmale@xtra.co.nz> Cc: <freebsd-chat@freebsd.org> Subject: RE: Mickey Mouse networking... Message-ID: <000201bea87f$08a86840$021d85d1@whenever.youwant.to> In-Reply-To: <Pine.LNX.4.02.9905271359260.30337-100000@mercury.webnology.com>
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And even if you assume that Microsoft is trying to remain compatible with older classful implementations, this is class B space. So even under the old rules, forgetting about VLSM and CIDR, this address would _still_ be valid. It's clearly valid under classless rules, as already pointed out. DS > On Fri, 28 May 1999, Dan Langille wrote: > > > I understood that ip addresses ending in either 0 or 255 were not to be > > used. They are both used as broadcast addresses. Is that correct? > > An IP address with all zeros in the node bits is a network address, and an > IP address with all ones in the node bits is a broadcast address. The > trick is determining what the node bits are, and that's what subnet masks > are for. They're contiguous bitmasks that specify the network bits of a > given IP address. > > For instance, 255.255.255.0.0 in binary is > > 11111111 11111111 00000000 00000000 > > The ones bits in the mask are network bits, the zeros are node bits. If > I've got the address 10.4.100.255 with a netmask of 255.255.0.0, it looks > like this: > > 00001010 00000100 01100100 11111111 > ^---------------^ ^---------------^ > network node > > The node portion is not all ones or zeros, so it's a valid node address. > > Cheers, > Mick To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message
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