From owner-freebsd-security Wed Nov 8 14:32:16 2000 Delivered-To: freebsd-security@freebsd.org Received: from digitaldaemon.com (digitaldaemon.com [63.105.9.34]) by hub.freebsd.org (Postfix) with SMTP id 89DF537B4C5 for ; Wed, 8 Nov 2000 14:32:09 -0800 (PST) Received: (qmail 44273 invoked from network); 8 Nov 2000 22:29:26 -0000 Received: from unknown (HELO smartsoft.cc) (192.168.0.73) by digitaldaemon.com with SMTP; 8 Nov 2000 22:29:26 -0000 Message-ID: <3A09D41D.B14D809C@smartsoft.cc> Date: Wed, 08 Nov 2000 17:30:53 -0500 From: Jan Knepper Organization: Smartsoft, LLC X-Mailer: Mozilla 4.76 [en] (Windows NT 5.0; U) X-Accept-Language: en MIME-Version: 1.0 To: FreeBSD Security Subject: loopback: 127.0.0.0/8 or 127.0.0.0/16 or 127.0.0.0/24??? Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-security@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org 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? Jan -- Jan Knepper Smartsoft, LLC 88 Petersburg Road Petersburg, NJ 08270 U.S.A. http://www.smartsoft.cc/ http://www.mp3.com/pianoprincess Phone : 609-628-4260 FAX : 609-628-1267 FAX : 303-845-6415 http://www.fax4free.com/ Phone : 020-873-3837 http://www.xoip.nl/ (Dutch) FAX : 020-873-3837 http://www.xoip.nl/ (Dutch) In God we Trust -- all others must submit an X.509 certificate. -- Charles Forsythe To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message