Date: Wed, 8 Nov 2000 19:54:14 -0500 From: Will Andrews <will@physics.purdue.edu> To: Jan Knepper <jan@smartsoft.cc> Cc: FreeBSD questions <questions@FreeBSD.org> Subject: Re[2]: loopback: 127.0.0.0/8 or 127.0.0.0/16 or 127.0.0.0/24??? Message-ID: <20001108195414.C12659@puck.firepipe.net>
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[ actually redirect to -questions, sorry for dupe ] On Wed, Nov 08, 2000 at 05:30:53PM -0500, Jan Knepper wrote: > 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? It's 127.0.0.0/8, designated as a loopback IP block.. meaning that most any good firewall will block all data with an IP in this block, but allow it through lo0 (loopback interface). -- wca To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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