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Geek swap shop - Her Most Regal Majesty, the Queen of Snark
void where prohibited, except by law
sesquipedality
sesquipedality
Geek swap shop
Wanted: ADSL modem with an ethernet connection.

Will swap for: Intel ADSL USB modem.

No great urgency, since I don't get ADSL till May, but I thought I'd ask around.
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Comments
simonb From: simonb Date: October 3rd, 2004 09:43 pm (UTC) (Link)
Well, I've got an ASUS ADSL modem with ethernet connection which I'm not using any more. Unfortunately I don't need an ADSL USB modem :(
sesquipedality From: sesquipedality Date: October 3rd, 2004 11:01 pm (UTC) (Link)
I have a spare NTL cable modem if that'd be any use.

Failing that, I could always offer you cash.
simonb From: simonb Date: October 4th, 2004 12:11 am (UTC) (Link)
I have a spare NTL cable modem if that'd be any use.

Unfortunately not; whilst I'm in an NTL area, I'd rather use ADSL for my connectivity. If nothing else Zen give me a /29 network to play with :)
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simonb From: simonb Date: October 5th, 2004 12:13 am (UTC) (Link)
Well, yes. I've found that the wires-only ADSL service with a decent ADSL provider combined with the TiVo-a-like Sky+ service is way better than what NTL can provide.
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owdbetts From: owdbetts Date: October 5th, 2004 02:10 am (UTC) (Link)
I'm obviously confused, but I can't see how such a device could be useful in the UK.

Admitedly I'm posting this comment via an ethernet-attached ADSL modem, but as far as I can infer that's doing RFC1483 ethernet-in-ATM encapsulation, which wouldn't be much use on a PPPoA service.

The only ethernet-attached ADSL devices I've seen in the UK have been routers (typcally doing NAT)

-roy
sesquipedality From: sesquipedality Date: October 5th, 2004 08:53 am (UTC) (Link)
You plug it into the WAN port of an 802.11g wireless router.
owdbetts From: owdbetts Date: October 5th, 2004 05:08 pm (UTC) (Link)
The problem is that it can't be just a modem. UK ADSL uses PPP over ATM (RFC2364) so there are no ethernet frames that can simply be bridged. In fact, there are no MAC addresses on the link. So it'll have to do something hacky like proxyarp (and essentially it would end up being a router -- it has to be a layer 3 device)

-roy
sesquipedality From: sesquipedality Date: October 6th, 2004 02:00 pm (UTC) (Link)
http://www.overclockers.co.uk/acatalog/DSL___Cable_Modems.html would seem to suggest that you are wrong about this.
owdbetts From: owdbetts Date: October 6th, 2004 04:50 pm (UTC) (Link)
It would appear that these devices are dual-mode devices that can be used as either a modem or a router.

But at least some of them don't support ethernet in modem-mode in the UK.

eg see this

I guess the way to do it at layer 2 would be for the modem to forward the PPP frames using PPPoE, but that would require a PPPoE client on your PC (or a broadband router that supports PPPoE if you're using a router). Don't know if anyone actually implements this though...



sesquipedality From: sesquipedality Date: October 6th, 2004 08:27 pm (UTC) (Link)
surely you can just connect it to the wireless AP when in route mode? Certainly I would expect the wireless router to know only "this ethernet port is upstream".Or an I misunderstanding what's meant by an ADSL modem in router mode?
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sesquipedality From: sesquipedality Date: October 4th, 2004 07:10 am (UTC) (Link)
Did the same to me earlier.

Thanks for the (potential) offer.
(Deleted comment)
sesquipedality From: sesquipedality Date: October 4th, 2004 07:19 am (UTC) (Link)
It's raining. Rain good.

But yes, this time in the morning should not exist.
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