Date: Sun, 23 Sep 2001 15:04:58 -0700 From: "Kevin Oberman" <oberman@es.net> To: "Juha Saarinen" <juha@saarinen.org> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: loopback not working for anything other than 127.0.0.1 Message-ID: <200109232204.f8NM4wR20667@ptavv.es.net> In-Reply-To: Your message of "Mon, 24 Sep 2001 09:15:38 %2B1200." <003401c14474$e4d53e40$0a01a8c0@den2>
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> From: "Juha Saarinen" <juha@saarinen.org> > Date: Mon, 24 Sep 2001 09:15:38 +1200 > > :: I don't think any RFC actually calls for this, but 1122 is probably > :: the relevant reference. From 3.2.1.3: > :: (g) { 127, <any> } > :: > :: Internal host loopback address. Addresses of this form > :: MUST NOT appear outside a host. > > RFC 990 seems to cover it though: > > The class A network number 127 is assigned the "loopback" > function, that is, a datagram sent by a higher level protocol > to a network 127 address should loop back inside the host. No > datagram "sent" to a network 127 address should ever appear on > any network anywhere. Except that 990 (and many similar RFCs) are an enumeration of assigned numbers, not a specification of operation. I read it very similarly to 1122. It assigned 127.0.0.0/8 as the loopback net and forbids any packet addressed to that /8 from leaving the host. It must be sent out to the lo interface. It says nothing about how the host should respond to receiving the packet. R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman@es.net Phone: +1 510 486-8634 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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