Date: Thu, 15 Nov 2001 08:20:02 -0800 (PST) From: .@babolo.ru To: freebsd-bugs@FreeBSD.org Subject: Re: kern/31891: Change mask of loopback net breaks compatibility with older versions Message-ID: <200111151620.fAFGK2l11241@freefall.freebsd.org>
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The following reply was made to PR kern/31891; it has been noted by GNATS.
From: .@babolo.ru
To: cjclark@alum.mit.edu
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 19:23:11 +0300 (MSK)
Crist J. Clark writes:
> 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.
OK.
Lets it be feature.
Consider please case where more then one
kernel looks for outside world as one entity.
May be name "cluster" is good enough in this case.
There no protection beetween kernels in such
environment and use of 127.X nets for interface
inside cluster somehow protects from outside world.
Yes, I remember another means too.
Sorry my English is bad.
--
@BABOLO http://links.ru/
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