<div dir="ltr">We have always deployed our phones to only use our own DNS and SNTP servers. The phones only accept the IP and gateway from DHCP. We found out about the issues because customers' IT people were asking us why the phones were working and "the internet" was not. After stringing them along on answers about voodoo and black magic, we figured it out. I posted here because not everyone doest things this way.<div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Mar 21, 2016 at 9:39 AM, Lee Riemer <span dir="ltr"><<a href="mailto:LRiemer@bestline.net" target="_blank">LRiemer@bestline.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">If you’ve deployed hard phones for these users, try configuring the phones to use your own DNS servers.<u></u><u></u></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> VoiceOps [mailto:<a href="mailto:voiceops-bounces@voiceops.org" target="_blank">voiceops-bounces@voiceops.org</a>]
<b>On Behalf Of </b>Carlos Alvarez<br>
<b>Sent:</b> Saturday, March 19, 2016 11:49 AM<br>
<b>To:</b> <a href="mailto:voiceops@voiceops.org" target="_blank">voiceops@voiceops.org</a><br>
<b>Subject:</b> [VoiceOps] Cox cable "outages" and a solution<u></u><u></u></span></p>
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<p class="MsoNormal">I'm posting this info here because I know quite a few of us have BYOI customers and may be affected by this. Cox users have been reporting a lot of outages lately in certain areas (it seems to cluster by whatever areas Cox is making changes
in). I found that when there is a supposed outage, the only thing that fails is DNS. You can still ping/trace/connect with an IP address. I looked at the router's DHCP-assigned info and found that it was seeing an IPv6 DNS as its primary, with the usual two
IPv4 servers as secondary/tertiary. Oddly, this didn't seem to happen right away, but would happen after the router had been up for a few hours. My best guess at the root problem is that Cox isn't properly handling IPv6 yet, even though they are advertising
it to the router. Completely disabling IPv6 in the router fixes it.<u></u><u></u></p>
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