[cisco-voip] ATA190

[NateCCIE]

Ah, but the 2nd port doesn’t have an actual MAC address, just a device name based on the mac of the device.

 

From: cisco-voip <cisco-voip-bounces at puck.nether.net> On Behalf Of Anthony Holloway
Sent: Tuesday, May 22, 2018 10:55 AM
To: Ryan Huff <ryanhuff at outlook.com>
Cc: Jon Fox <jonfoxipt at gmail.com>; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] ATA190

 

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.

 

Ah, but no such luck today.

 



 

Source: https://macvendors.com/

 

On Tue, May 22, 2018 at 4:30 AM, Ryan Huff <ryanhuff at outlook.com <mailto:ryanhuff at outlook.com> > wrote:

Yes, that is correct. 

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.

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).

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 :).

Thanks,

Ryan

> On May 22, 2018, at 04:57, Jon Fox <jonfoxipt at gmail.com <mailto:jonfoxipt at gmail.com> > wrote:
> 
> Hello All
> 
> Trying to troubleshoot an issue with a Cisco ATA - CUCM 10.5.2SU3
> 
> 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.
> 
> <image.png>
> 
> 
> Many thanks
> Jon
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> cisco-voip at puck.nether.net <mailto:cisco-voip at puck.nether.net> 
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