Date: Wed, 8 Nov 2000 23:30:16 -0800 From: "Crist J . Clark" <cjclark@reflexnet.net> To: Jan Knepper <jan@smartsoft.cc> Cc: FreeBSD Security <freebsd-security@FreeBSD.ORG> Subject: Re: loopback: 127.0.0.0/8 or 127.0.0.0/16 or 127.0.0.0/24??? Message-ID: <20001108233016.P75251@149.211.6.64.reflexcom.com> In-Reply-To: <3A09D41D.B14D809C@smartsoft.cc>; from jan@smartsoft.cc on Wed, Nov 08, 2000 at 05:30:53PM -0500 References: <3A09D41D.B14D809C@smartsoft.cc>
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On Wed, Nov 08, 2000 at 05:30:53PM -0500, Jan Knepper wrote:
> Hi!
>
> I have been monitoring some network traffic lately and figured
> that at a certain moment my system wanted to send a package out
> to 127.0.0.2:25 via the interface that is connected to the
> internet (the external interface). Actually, my firewall blocked
> the packets, but I wondered why the heck it would try something
> like that to begin with.
> Next to that I wondered, since 127.0.0.0/8 is the loopback
> interface what is really going on and wether or not packets to
> or from 127.0.0.0/8 traveling through the external interface
> should be blocked or not. Should it be something else than
> 127.0.0.0/8 (/16? /24?). I know there are unregistered IP ranges
> RFC1918, but I didn't read anything about 127.0.0.0...
>
> Can anyone shed any light?
$ whois -a 127.0.0.0
IANA (LOOPBACK)
Netname: LOOPBACK
Netnumber: 127.0.0.0
Coordinator:
Internet Corporation for Assigned Names and Numbers (IANA-ARIN) iana@IANA.ORG
(310) 823-9358
Record last updated on 02-Mar-1998.
Database last updated on 8-Nov-2000 18:13:25 EDT.
The ARIN Registration Services Host contains ONLY Internet
Network Information: Networks, ASN's, and related POC's.
Please use the whois server at rs.internic.net for DOMAIN related
Information and whois.nic.mil for NIPRNET Information.
Since loopback dates back to the days of network classes, and it is a
Class A address, the mask is 255.0.0.0.
--
Crist J. Clark cjclark@alum.mit.edu
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