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<p>2 from 2 of the Arcadyan modems supplied to other family by Telstra have exhibited the same issue. Whirlpool is full of complaints of similar things. Something to do with UPNP apparently.</p>
<p>"Intermittent internet access" is the typical reported fault, however when debugging the issue I found the working sites were all IPv6 and the non-working ones were IPv4 only.</p>
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<p>As not to get to get more tech support calls from family, the Telstra boxes were reassigned to be dumb ATA's only (seeing you cant get the SIP config from Telstra) and a MikroTik router was placed in front doing the work and heavy lifting from the NBN NCD.</p>
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<p>Both premises were FttC.</p>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> AusNOG <ausnog-bounces@lists.ausnog.net> on behalf of Jamie Lovick <jalovick@doof.org><br>
<b>Sent:</b> Tuesday, 15 October 2019 19:57<br>
<b>To:</b> Karl Auer<br>
<b>Cc:</b> AUSNOG<br>
<b>Subject:</b> Re: [AusNOG] (Probably a bit OT) IPv6 oddity</font>
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<div dir="auto">I've seen those Optus branded Netgear cable routers stop handing out DHCP to the local network, but will continue to route just fine. Typically, if there is bad power (brownouts, etc.), this can happen. </div>
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<div dir="auto">Jamie</div>
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<div dir="ltr" class="gmail_attr">On Tue, 15 Oct 2019 at 3:05 pm, Karl Auer <<a href="mailto:kauer@biplane.com.au">kauer@biplane.com.au</a>> wrote:<br>
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<blockquote class="gmail_quote" style="margin:0 0 0 .8ex; border-left:1px #ccc solid; padding-left:1ex">
Had an interesting (to me) case last week. Client rang on his mobile to<br>
say his phones didn't work and also he couldn't get to his bank or<br>
anything else - except Google. Also, I found I was able to use<br>
TeamViewer to access one of his PCs.<br>
<br>
He's on NBN over FTTC (or maybe FTTN) with Telstra.<br>
<br>
Turned out his Telstra router was supplying a valid prefix to<br>
autoconfigure IPv6 addresses in, but it was not supplying IPv4<br>
addresses via DHCP. Reset the router and it all came good.<br>
<br>
This is the first time I've seen this in the wild where it was not a<br>
misconfiguration (though I'm the first to admit that "the wild" is more<br>
of an inoffensive thicket in my case). Is it more common than I think?<br>
<br>
Regards, K.<br>
<br>
-- <br>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br>
Karl Auer (<a href="mailto:kauer@biplane.com.au" target="_blank">kauer@biplane.com.au</a>)<br>
<a href="http://www.biplane.com.au/kauer" rel="noreferrer" target="_blank">http://www.biplane.com.au/kauer</a><br>
<a href="http://twitter.com/kauer389" rel="noreferrer" target="_blank">http://twitter.com/kauer389</a><br>
<br>
GPG fingerprint: 8D08 9CAA 649A AFEF E862 062A 2E97 42D4 A2A0 616D<br>
Old fingerprint: A0CD 28F0 10BE FC21 C57C 67C1 19A6 83A4 9B0B 1D75<br>
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<div><font face="courier new, monospace">Jamie Lovick <-> IT Consultant <-> AU <-> +61-4-1479-1681</font></div>
<div><font face="Courier New"> -> US <-> +1-8018-4-52643 (JAMIE)</font></div>
<div><font face="Courier New"> -> FR <-> +33-9-7073-0340</font></div>
<div><font face="courier new, monospace">Doof.org -> Em <->
<a href="mailto:jalovick@doof.org" target="_blank">jalovick@doof.org</a></font></div>
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