HELP! iMac, cable modem won't go. - Page 3

stripes · 22-02-2007, 12:45

Mark: it's10.4.7, so very late.

NTLVictim: I agree, most of the experts round here agree. So who doesn't? That's right, NTL. But WHAT CAN I DO? I'm quite prepared to go Sky or someone else for all services (and thus hopefully get a working broadband).

When questioned on this, the guy on ntl's phone said that they Couldn't do manual resets, they DIDN'T do manual resets, and they didn't NEED to do manual resets, as the SYSTEM (gord help us) was fully automatic, and did its own resets.

So what can I do? I paid eight hundred quid odd so that I could have a nice new machine (after ten years it seemed about time), and I don't want to have to keep two Macs, one for talking to you guys, and one for non-www stuff.

Help......

Allen.

Dark Fiber · 22-02-2007, 12:48

Quote:

Originally Posted by NTLVictim

If Stripe can see the modem page on both Macs but can only see the Internet on the G3, logically that points at the Imac being refused throughput for some reason...second opinion, please!

I agree that is by far the most likely situation, with the proviso that there could be a hardware/software problem with the iMac.
I know that the cable system is supposed to provide more than one address so that a different MAC can be connected and receive an IP address without a restart, but I would now turn the modem off for an hour and then start up the new computer only after the modem has been powered on with lights stabilized for a few minutes.

stripes · 22-02-2007, 12:52

NTLVictim: interesting post on that link, but no lightning strikes round NW9 in the past week! However, I might try taking my set-top box off and see what happens - it's not directly connected. Cable comes in the wall, then a splitter sends one signal to STB and one to cable modem.

Dark: tried full power down for twenty hours the other day (see an early posting) without success. Do you think it's worth doing it again?

Allen.

Dark Fiber · 22-02-2007, 12:56

Quote:

Originally Posted by stripes

Dark: tried full power down for twenty hours the other day (see an early posting) without success. Do you think it's worth doing it again?

Allen.

Yes, but not for that long

If this fails with the iMac, immediately switch the ethernet to the G3 without a modem restart.

melevittfl · 22-02-2007, 13:06

Quote:

Originally Posted by NTLVictim

I said that, but I was more concise.

---------- Post added at 13:40 ---------- Previous post was at 13:32 ----------

Is this germane to the problem?

Yup, bad habbit of mine.

I don't think the issue is the same as he's already gotten a replacement iMac from Apple.

maverick · 22-02-2007, 13:06

What I cant understand is that the modem config page can be viewed on the new mac with a 169 ip address,this should not happen.
Any mac bods out there confirm if the mac address of the working mac can be cloned onto the new mac?
If this is possible it would be worth a shot.

NTLVictim · 22-02-2007, 13:08

What about the bit that said

"On the iMac open your preferences, select Built-In Ethernet from the list, then click on Configure. Click on the TCP/IP tab and set the Configure drop down menu to DHCP. Click on Apply Now, then quit Network.

Turn off the the ] modem and the computer and wait about five minutes. Then turn on the cable modem and wait until the status indicators show it's communicating with the network. Then power up the. See if this gets your connection re-established properly."

I'm guessing, I'm using Xp Pro..

melevittfl · 22-02-2007, 13:11

Stripes,

From the Terminal application again, can you please type the following command:
ipconfig getpacket en0

(notice it's ipconfig with a "p" this time).

I'm interested in the lines that start
op =
yiaddr =

in particular.

NTLVictim · 22-02-2007, 13:13

Whoa, hang on..STB?

STB's don't like different mac addresses, is this interfering with the SACM somehow??

Chris W · 22-02-2007, 13:14

Try changing the mac address of the ethernet card on the new mac to the same as it was on the old mac by doing the following:

To find the mac address on the old mac, go to apple -> control panel -> tcp/ip -> ethernet. Then go to "get info" from the file menu and write down the mac address.

Then on the new mac check which interface the ethernet card is - it will be en0, en1, en2 etc depending on whether you have an airport card, dial up modem etc. When you have identified this open terminal and type the following:

sudo ifconfig enX lladdr [new mac]

where X corresponds to the ethernet card, and [new mac] is the mac address from the old mac.

Then reboot everything and connect up the cable modem... hopefully this should get you sorted

stripes · 22-02-2007, 13:39

Sorry, this is going to be a bit slow, as any iMac / internet testing means I have to disconnect this machine.

Anyway...

Dark: I will try the longer powerdown shortly. As it happens, I DID just pull the ethernet from the iMac and stick it back into the G3 WITHOUT rebooting the other day (fed up with waiting) and the internet connection worked fine on the G3. Haven't tried it the other way round, though.

NTL victim: see answer above to Dark. I will do what you suggest, but I have done that dozens (no joke) of times already.

Mark: no go with the ipconfig getpacket en0 prompt:
Just gives me back
localhost:- allen..... etc. no other data.
(Mind, ethernet currently disconnected. I'll run that test again in a min. when I've connected iMac to modem).

NTLVictim. As I stressed, STB isn't directly on the circuit with the modem. NTL cable comes in the wall, to a splitter (ntl fitted all this, of course). From the splitter one cable goes to the STB, one to the modem. I COULD disconnect the STB (i.e. pull out ITS coaxial) if that would help isolate it. Yes/no?

Chris W. I'll have a got at that lot, and report back when I get stuck.

Allen.

NTLVictim · 22-02-2007, 13:44

My money is on what Chris said will work.

Can a STB on the same line cause this problem? anyone know?

stripes · 22-02-2007, 13:51

Chris: just noticed that you say ''then connect the modem'' etc., so I did that on Terminal while I was still unconnected. Took the string, came back with:
We trust you have received the usual lecture from the local System Administrator. It usually boils down to these three things....

blah blah.

then: Password. Tried putting in my iMac password, but wouldn't take any more keyboard input.

Now to switch ethernet and reboot all...

Allen.

melevittfl · 22-02-2007, 14:02

Quote:

Originally Posted by stripes

We trust you have received the usual lecture from the local System Administrator. It usually boils down to these three things....

That's the message that the "sudo" command prints the first time it's run. It shouldn't do that a second time.

It should accept the password, but it won't display anything while you're typing so it may look like it's not working.

NTLVictim · 22-02-2007, 14:21

Information on the sudo command Here