<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr"><a href="https://www.ultratools.com/tools/rfcLookup">https://www.ultratools.com/tools/rfcLookup</a></div><div dir="ltr"><br></div><div dir="ltr">Search for 0.0.0.0</div><div dir="ltr"><br></div><div dir="ltr">The value is used in several protocols in different ways.</div><div dir="ltr"><br></div><div dir="ltr">But that doesn’t seem to be what’s been asked. I don’t know about it’s use in transitioning or historically. You might search the IENs for that. </div><div dir="ltr"><br></div><div dir="ltr">Joe</div><div dir="ltr"><br>On Feb 11, 2019, at 11:31 PM, Andrew G. Malis <<a href="mailto:agmalis@gmail.com">agmalis@gmail.com</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr"><div dir="ltr">Dave,<div><br></div><div>The answer is in RFC 792, of course (the ICMP spec). In a quick scan, I see zero in the network field on page 19. It was a way for a host on a LAN to query its router to find out its network number.</div><div><br></div><div>Cheers,</div><div>Andy</div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Feb 11, 2019 at 5:55 PM Dave Taht <<a href="mailto:dave@taht.net">dave@taht.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">"Andrew G. Malis" <<a href="mailto:agmalis@gmail.com" target="_blank">agmalis@gmail.com</a>> writes:<br>
<br>
> Dave,<br>
><br>
> From RFC 791: "A value of zero in the network field means this<br>
> network.".<br>
<br>
<br>
A bit short, don't ya think? :) the full ref expounded with.<br>
<br>
"This is only used in certain ICMP messages. "<br>
<br>
Which ones?<br>
<br>
<br>
Did the 0 mean that on a shared local lan, it was represented as 0 there,<br>
and transmitted as something else elsewhere? Or vice versa?<br>
<br>
<br>
><br>
> Cheers,<br>
> Andy<br>
><br>
> On Mon, Feb 11, 2019 at 3:37 PM Dave Taht <<a href="mailto:dave@taht.net" target="_blank">dave@taht.net</a>> wrote:<br>
><br>
> Brian Carpenter just turned me onto this list. As part of an<br>
> upcoming<br>
> internet draft, I'd wanted to be able to coherently discuss the<br>
> origin<br>
> and original use cases of the "this" network "0" in Arpanet to<br>
> early<br>
> ipv4 transition days, and thus far I haven't found much<br>
> information on<br>
> it.<br>
> <br>
> I'm curious if there is a reference on it somewhere?<br>
> <br>
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> <br>
</blockquote></div>
</div></blockquote><blockquote type="cite"><div dir="ltr"><span>_______</span><br><span>internet-history mailing list</span><br><span><a href="mailto:internet-history@postel.org">internet-history@postel.org</a></span><br><span><a href="http://mailman.postel.org/mailman/listinfo/internet-history">http://mailman.postel.org/mailman/listinfo/internet-history</a></span><br><span>Contact <a href="mailto:list-owner@postel.org">list-owner@postel.org</a> for assistance.</span><br></div></blockquote></body></html>