Date: Thu, 15 Nov 2001 02:00:07 -0800 (PST) From: "Crist J. Clark" <cristjc@earthlink.net> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/31891: Change mask of loopback net breaks compatibility with older versions Message-ID: <200111151000.fAFA07111605@freefall.freebsd.org>
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The following reply was made to PR kern/31891; it has been noted by GNATS.
From: "Crist J. Clark" <cristjc@earthlink.net>
To: .@babolo.ru
Cc: FreeBSD-gnats-submit@FreeBSD.ORG
Subject: Re: kern/31891: Change mask of loopback net breaks compatibility with older versions
Date: Thu, 15 Nov 2001 01:58:48 -0800
On Sat, Nov 10, 2001 at 07:11:26AM +0300, .@babolo.ru wrote:
[snip]
> >Description:
>
> There was 4.2 RELEASE, where packets with 127.0.0.0/24 source address
> droped on input interfaces. Now it changed to 127.0.0.0/8,
> which is incombatible with old configuration.
> This net - 127.0.0.0/8 is extremly useful
> as private net in clustering environment,
> so I propose configuration variable MYLOOP_MASKLEN,
> with default meaning that conforms RFC1122
>
> >How-To-Repeat:
>
> Try P2P addresses in 127.0.0.0/8 net.
This is a feature, not a bug. See RFC1122, "Requirements for Internet
Hosts,"
(g) { 127, <any> }
Internal host loopback address. Addresses of this form
MUST NOT appear outside a host.
The 127/8 is never valid when coming from another host.
Do not use 127/8 as a private network, that's what RFC1918 addresses
are for.
--
Crist J. Clark | cjclark@alum.mit.edu
| cjclark@jhu.edu
http://people.freebsd.org/~cjc/ | cjc@freebsd.org
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