Re: LAN IP addresses

On Sun, 07 Sep 2008, in the Usenet newsgroup comp.os.linux.networking, in
article <ga0eje$1m51$1@xxxxxxxxxxxxxxxxxx>, Pascal Hambourg wrote:

Moe Trin a écrit :

By the way, there is nothing sacred about the "zero" address, and
some operating systems specifically do allow use of the "network"
address as a _host_ address.

RFC 1812 states otherwise in § 4.2.2.11, 4.2.3.1, 5.3.5.

Perhaps the word "sacred" is to strong. None the less with the advent
of CIDR, the meaning of the "network" and "broadcast" address can not
be known to outsiders, and some operating systems now allow the
network address to be used for hosts. I know someone who has a
security monitor set to that address, just because he knows that
every skript kiddie in the world knows not to bother looking at it.
But then, a lot of people misinterpret RFC1122 Section 3.2.1.3 on
page 31 (third paragraph below (g)) as prohibiting a zero (or -1
which they don't understand) in any host part.

If such an address is used, it must be treated as a broadcast and
cannot be used as a host address.

The "network" address has not been used as a broadcast address for a
long time - 4.2BSD was replaced by 4.3 a bit over twenty years ago.

While it's a work in progress, you may want to read through the
draft-gont-opsec-ip-security-01.txt document available through your
favorite RFC Editor or mirror.

Old guy
.

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