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Date:      Mon, 24 Sep 2001 08:15:16 -0700 (PDT)
From:      Lamont Granquist <lamont@scriptkiddie.org>
To:        Juha Saarinen <juha@saarinen.org>
Cc:        "freebsd-stable@FreeBSD.ORG" <freebsd-stable@FreeBSD.ORG>
Subject:   RE: loopback not working for anything other than 127.0.0.1
Message-ID:  <20010924081248.R5179-100000@coredump.scriptkiddie.org>
In-Reply-To: <Pine.LNX.4.33.0109241217430.10108-100000@vimfuego.saarinen.org>

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On Mon, 24 Sep 2001, Juha Saarinen wrote:
> > i do agree, though, that the lack of a route for 127/8 does seem to break
> > the RFC.  it states that 127/8 isn't supposed to leave the host, but:
> >
> > # tcpdump host 127.1.1.1
> > tcpdump: listening on fxp0
> > 17:11:49.048088 192.168.69.11 > 127.1.1.1: icmp: echo request
> > 17:11:50.053303 192.168.69.11 > 127.1.1.1: icmp: echo request
> > 17:11:51.063315 192.168.69.11 > 127.1.1.1: icmp: echo request
> >
> > clearly they do.
>
> Did you mean '127.0.0.1' above? Also, doesn't the packet dump say that
> it's seeing ICMP echo requests going to 127.1.1.1, but not actually
> leaving it? Or am I reading it wrong?

It says "listening on fxp0" which means you're seeing packets exiting the
box out the ethernet interface.  And if I'd used 127.0.0.1 it would have
correctly gone out lo0.


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