Date: Wed, 28 Aug 1996 08:15:47 -0500 (CDT) From: ptroot@uswest.com (Paul T. Root) To: nickliu@netcom.com Cc: questions@freebsd.org Subject: Re: "Re: UTP to UTP Networking'" Message-ID: <199608281315.IAA20460@astro.acs.uswest.com> In-Reply-To: <199608272038.PAA13185@horton.iaces.com> from "The Filter of proot@horton.iaces.com" at Aug 27, 96 03:38:24 pm
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In a previous message, The Filter of proot@horton.iaces.com said: > > > Your netmasks don't match your broadcast, and your broadcast should > > actually go to a subnet not a node. > > I'd do something like > > > > ifconfig ed0 192.168.253.x broadcast 192.168.253.11 netmask 0xfffffffc > > > > Broadcast will be automatically set via the netmask. > > > > Paul. > > > > > > I know someone wise enough will stand up and be willing to teach me > something. Thanks, Paul. > > In the address above, the broadcast address was set to 192.168.253.11, > why 11 and not 10? In lp0 (laplink interface), I do: This is how subnetting works. I set the netmask to 255.255.255.252 ok. That leaves you 2 bits for your sub net. Your addresses are 9 - 00001001 10 - 00001010 and we'll throw in 8 and 11: 8 - 00001000 11 - 00001011 then the netmask 252 252 - 11111100 So with a 2 bit subnet you get 00, 01, 10 and 11. You generally don't use 00, and 11 is broadcast (that's the same as 255 in an 8 bit subnet). So a broadcast wants to go to the broadcast subnet. 252 is the subnet we use to put together point to point and Frame Relay links. > ifconfig lp0 192.168.253.7 192.168.253.8 > route add ... > > and > > ifconfig lp0 192.168.253.8 192.168.253.7 > route add ... > > And it worked fine. I know it would be just a simple knock-on-the-forehead > hint to make me understand all that. > > Please give me a punch instead of a knock. Thanks. > > > -- End of filtered message -- > -- Paul T. Root - USWEST !NTERPRISE Networking Service ptroot@uswest.com "Your friend dissected, yourself a mental vegetable; not a pleasant prospect, is it, Captain?" -- Kang
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