Modems gone off: Read this

[sputnikk]

I can also confirm that it's now happening in the Glasgow area.

(After watching everyone complain for the last 2 weeks, it's finally worked it's way up here...)

EDIT: The way I understand it regarding CPC and UBR etc (correct me if i'm wrong please sr20...):

CPC(Customer Premise Card) is a reference to the DHCP scope of whatever ip range you are in.

The **n1-n2-n3** section is a deprecated way of describing the **cmts_number-card-downstream_port** on the old network

E.g Now it would translate as: cpc2-<ubr>1-0-0 = DHCP scope2, <ubr>, CMTS 1

Scanning from a different CPC would give a different DHCP scope (albeit, on the same UBR)...

[mattjames78]

For my next trick, I will attempt to dig up all of the UK, lay my own co-ax and fibre-optic cable, put little dark green doggy pee-posts on every street corner, provide a market-leading fast infrastructure (ahem), and have almost zero safeguards to protect my investment for the best part of a decade...Who`s with me?

BTW would macs sniffed before the update from different CPCs have worked on the same UBR before all this started happening? Not relavent just curious.

[sputnikk]

^^ That should be <ubr_name> eg: cowc or whatever you get at tools.virginmedia.com

[sr20]

@ sputnikk

Thanks for extra details. Yup, and that's what we require.

If you compare this to the PDF it makes sense why this works. Modem is not flagged as being out of area, so no further clone detection processes are run. This gets us our initial DHCP offer.

At the same time we don't get ARP troubles from MAC conflicts, so no "Bandwidth request failure" + reboot loop.

[sr20]

Originally Posted by mattjames78

BTW would macs sniffed before the update from different CPCs have worked on the same UBR before all this started happening? Not relavent just curious.

It would seem that way, although i've never seen anyone mention CPCs until now. It wasn't worth bothering with then as MACs from different UBRs worked.

[lee-ds]

Never thought about sniffing from the same uBR but different DHCP scope, nice find if it works SR20.

I'll look in to it, bit late to be making calls now though lol

[sputnikk]

I can also now confirm (along with sr20) that different CPC's yield usable MACs. (For how long though - who knows.....)

[farkkraf]

Is it possible to sniff different cpc's from your home or do you need to phisically go to someone else's house to do it?

[deadman121]

Originally Posted by sputnikk

I can also now confirm (along with sr20) that different CPC's yield usable MACs. (For how long though - who knows.....)

Hi, could you please tell me how to sniff for a MAC in that way? What would be the best program to use and settings? How long should I sniff for and should I do it from my computer where I want the mac to be usable? Would be great if you or anyone else could provide me with the information!

[sr20]

Originally Posted by sputnikk

I can also now confirm (along with sr20) that different CPC's yield usable MACs. (For how long though - who knows.....)

Excellent news

Going by that PDF VM seem to have based their system on, the MACs can only be localised down to UBR.

So you never know, they may work for good....until there's no d10's left to sniff.