Rogers static name

[Lennart Sorensen]

On Tue, May 29, 2012 at 11:19:36AM -0400, D. Hugh Redelmeier wrote:
> Others have answered.  So I'll diverge.
> 
> How do you find out your Rogers IP address from inside your NAPTed
> LAN?  The thread from earlier this month "How do you check your
> external IP?" had good answers.  My favourite, from Sadiq Saif, was
> 	curl -q http://icanhazip.com/
> 
> What is that odd domain name that Rogers gives you?  It turns out that
> part of the name is the MAC address, in hex, of the device talking to
> the modem.  In most setups, that is the MAC address of the WAN
> interface of the broadband router.  The MAC address is preceded by CPE
> (Customer Premises Equipment?).
> 
> The second part starts with CM and looks like it might be a MAC
> address too.  The same number is listed on the modem's label as HFC
> MAC ID.
> 
> If I use the OUI Lookup Tool
>   <http://www.wireshark.org/tools/oui-lookup.html>
> on the CM number, it says:
>   00:0F:9F Motorola Mobility, Inc.
> This makes sense as the cable modem is a Motorola device.
> 
> If I google for my CM number, all the hits are for me.  So it looks to
> be unique (as a MAC should be).  Spooky: google finds geolocation
> pages and lots of ancient IRC logs.

The address is cpeCABLEMODEMMAC-cmETHERNETMAC, plus some bits indicated
the region on the rogers cable network you are in.

So if you connect a plain old cable modem to your PC, then it will
have the cable modem's address and your PC's ethernet card address.
If you connect the cable modem to a router, it will have the router's
mac address.

With the newer cablemodem/router integrated things, both MAC addresses
would come from that device.

-- 
Len Sorensen
--
The Toronto Linux Users Group.      Meetings: http://gtalug.org/
TLUG requests: Linux topics, No HTML, wrap text below 80 columns
How to UNSUBSCRIBE: http://gtalug.org/wiki/Mailing_lists