Date: Sun, 10 May 1998 15:39:31 -0700 (PDT) From: "Jonathan M. Bresler" <jmb> To: jonny@coe.ufrj.br (Joao Carlos Mendes Luis) Cc: x5gb7uk9@wna-linknet.com, freebsd-net@FreeBSD.ORG Subject: Re: home network Message-ID: <199805102239.PAA21595@hub.freebsd.org> In-Reply-To: <199805102107.SAA04000@roma.coe.ufrj.br> from Joao Carlos Mendes Luis at "May 10, 98 06:07:51 pm"
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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. jmb > > If you need the equivalent of a class A address, use net 10.0.0.0 > > Quoted from RFC1918: > > 3. Private Address Space > > The Internet Assigned Numbers Authority (IANA) has reserved the > following three blocks of the IP address space for private internets: > > 10.0.0.0 - 10.255.255.255 (10/8 prefix) > 172.16.0.0 - 172.31.255.255 (172.16/12 prefix) > 192.168.0.0 - 192.168.255.255 (192.168/16 prefix) > > We will refer to the first block as "24-bit block", the second as > "20-bit block", and to the third as "16-bit" block. Note that (in > pre-CIDR notation) the first block is nothing but a single class A > network number, while the second block is a set of 16 contiguous > class B network numbers, and third block is a set of 256 contiguous > class C network numbers. > > 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 > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-net" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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