Date: Sun, 10 May 1998 19:57:58 -0300 (EST) From: Joao Carlos Mendes Luis <jonny@coe.ufrj.br> To: jmb@FreeBSD.ORG (Jonathan M. Bresler) Cc: jonny@coe.ufrj.br, x5gb7uk9@wna-linknet.com, freebsd-net@FreeBSD.ORG Subject: Re: home network Message-ID: <199805102257.TAA01239@roma.coe.ufrj.br> In-Reply-To: <199805102239.PAA21595@hub.freebsd.org> from "Jonathan M. Bresler" at "May 10, 98 03:39:31 pm"
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#define quoting(Jonathan M. Bresler)
// Joao Carlos Mendes Luis wrote:
// > #define quoting(Arnold J. Rimmer)
// > // ed0: flags=8843 <UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
// > // inet 192.168.1.2 netmask 0xff000000 broadcast 192.168.1.255
^^^^^^^^^^^^^^^^^^
^^^^^^^^^^^^^^^^^^
// > // ether 00:00:c0:0f:62:9b
// >
// > Hey, your netmask is wrong !
//
// no! it is not wrong!
//
// the netmask is limited by two factors:
// upper limit: address space that you are allowed to use
// from rfc1918 the maximal netmask is 255.255.0.0
// or 192.169/16, to use the correct description.
// lower limit: 4 addresses which is a /30.
// our network connections to uunet and crl
// are both /30 networks (if they could use /31 or /32
// networks they would)
//
// between those two limits you are free to define the
// netmask on whatever bit boundary suits your needs.
Hi Jonathan,
Look again: 0xff000000 is /8, which is not between /16 and /30.
The broadcast address indicates a netmask of /24, but it may have
been set manually.
Jonny
--
Joao Carlos Mendes Luis jonny@gta.ufrj.br
+55 21 290-4698 ( Job ) jonny@coppe.ufrj.br
M.Sc. Student Electrical Engineering
Universidade Federal do Rio de Janeiro
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