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<p class="MsoNormal">Forgive my digressions and tangents; I’ve been reading SIP debugs for a large swath of the day; I’m in that “techsplaining” mode. After a re-read, I do hope you know I wasn’t implying you might know that already
<span style="font-family:"Segoe UI Emoji",sans-serif">😊</span>. </p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I understand now, the humor in what you’re saying <span style="font-family:"Segoe UI Emoji",sans-serif">
😊</span>. I could imagine that would flip the I3E on their heads … all the sudden, Belkin OUIs start showing up in ARP tables coming from Cisco ATAs, lol.
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<p class="MsoNormal">Thanks,</p>
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<p class="MsoNormal">Ryan</p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Anthony Holloway <avholloway+cisco-voip@gmail.com><br>
<b>Sent:</b> Tuesday, May 22, 2018 2:45:59 PM<br>
<b>To:</b> Ryan Huff<br>
<b>Cc:</b> Jon Fox; cisco-voip@puck.nether.net<br>
<b>Subject:</b> Re: [cisco-voip] ATA190</font>
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<div dir="ltr">Haha, that was way more than I was suggesting. I was just thinking like, what if the second vendor was like Selsius, and a tip of the hat. An easter egg of sorts.</div>
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<div dir="ltr">On Tue, May 22, 2018 at 12:46 PM Ryan Huff <<a href="mailto:ryanhuff@outlook.com">ryanhuff@outlook.com</a>> wrote:<br>
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<p class="MsoNormal">As I recall, from the last time I had the occasion to deal with an ATA; I think port 1 uses the device’s media access code, and is what ultimately gets resolved into the ARP table. From a network perspective, I don’t think any thing/scanner
could ever “see” a non-cisco device on the network due to this method (which is why I believe Cisco may have chose this behavior), short of what you’ve done here by manually looking up the ‘spoofed’ OUI that is reported by RIS in the CCM GUI.</p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I believe, if I’m not mistaken, the ATA uses <i>software magic</i> to register/communicate port 2 with a shifted/appended MAC address to “play nice” with CCM’s unique device name requirement. I could be entirely wrong though; I’m basing
my statements off of dated experience (I haven’t used an ATA in close to a year) and I don’t have an ATA at the ready to test with.</p>
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<p class="MsoNormal">Thanks,</p>
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<p class="MsoNormal">Ryan<u></u><u></u></p>
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<p class="MsoNormal" style="border:none;padding:0in"><b>From: </b><a href="mailto:avholloway+cisco-voip@gmail.com" target="_blank">Anthony Holloway</a><br>
<b>Sent: </b>Tuesday, May 22, 2018 12:54 PM<br>
<b>To: </b><a href="mailto:ryanhuff@outlook.com" target="_blank">Ryan Huff</a><br>
<b>Cc: </b><a href="mailto:jonfoxipt@gmail.com" target="_blank">Jon Fox</a>; <a href="mailto:cisco-voip@puck.nether.net" target="_blank">
cisco-voip@puck.nether.net</a><br>
<b>Subject: </b>Re: [cisco-voip] ATA190</p>
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<p class="MsoNormal">Aren't the first few values of a MAC tied to the vendor? If so, does this trick make it look like the second port is a different vendor product? And if so, it would be funny if it was a competitor.
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<p class="MsoNormal">Ah, but no such luck today.<u></u><u></u></p>
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<p class="MsoNormal"><img border="0" width="339" height="317" style="width:3.5312in;height:3.302in" id="m_-1787902596141616848Picture_x0020_3" alt="cid:ii_jhhx33e01_16388c3b26b144f0" src="cid:ii_jhhx33e01_16388c3b26b144f0"><u></u><u></u></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Source: <a href="https://macvendors.com/" target="_blank">https://macvendors.com/</a><u></u><u></u></p>
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<p class="MsoNormal">On Tue, May 22, 2018 at 4:30 AM, Ryan Huff <<a href="mailto:ryanhuff@outlook.com" target="_blank">ryanhuff@outlook.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Yes, that is correct. <br>
<br>
The ports are differentiated by the device name. However, the ports themselves are registered to CCM and communicate on the network through a single network interface on the ATA.<br>
<br>
The second port in the ATA will have the first two characters striped from the beginning of the MAC address and a “01” appended at the end of the MAC address (shown in the device name of the two ports).<br>
<br>
Essentially, the ATA is a mini, purpose built media conversion switch. A lot going on under the hood of those silly little things when you think about it :).<br>
<br>
Thanks,<br>
<br>
Ryan<br>
<br>
> On May 22, 2018, at 04:57, Jon Fox <<a href="mailto:jonfoxipt@gmail.com" target="_blank">jonfoxipt@gmail.com</a>> wrote:<br>
> <br>
> Hello All<br>
> <br>
> Trying to troubleshoot an issue with a Cisco ATA - CUCM 10.5.2SU3<br>
> <br>
> I've not had to touch these for some time, so cannot remember if its natural behaviour for Port 1 and Port 2 registering with the same IP address? Is that standard? - Screenshot attached.<br>
> <br>
> <image.png><br>
> <br>
> <br>
> Many thanks<br>
> Jon<br>
> _______________________________________________<br>
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