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Cellular forums Home > Archive > Cell Phones in Great Britain > October 2007 > Contacting a data card
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Contacting a data card
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| John Dann 2007-10-29, 12:33 pm |
| If I have a laptop fitted with eg a Vodafone datacard, is there any
way to establish a link to my laptop from another location, let's say
a desktop PC on a standard ADSL connection? To be clear, I want the
_desktop_ PC to initiate the link, in other words to send IP packets
to the laptop and get it to do something - having the laptop initiate
the link won't work for my scenario.
I presume that each datacard doesn't get given its own public IP
address, but maybe there is some other mechanism by which packets can
be addressed specifically to my laptop (assuming of course that it's
switched on etc.)
TIA
John Dann
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| news@prodata.co.uk declared for all the world to hear...
> If I have a laptop fitted with eg a Vodafone datacard, is there any
> way to establish a link to my laptop from another location, let's say
> a desktop PC on a standard ADSL connection? To be clear, I want the
> _desktop_ PC to initiate the link, in other words to send IP packets
> to the laptop and get it to do something - having the laptop initiate
> the link won't work for my scenario.
>
> I presume that each datacard doesn't get given its own public IP
> address, but maybe there is some other mechanism by which packets can
> be addressed specifically to my laptop (assuming of course that it's
> switched on etc.)
Another poster recently asking the same question was directed to a site
where Vodafone datacard could be purchased which gave a public IP
address. You would of course have to leave the leptop and datacard
powered on and connected all of the time.
Without a public IP address you can forget it.
--
Regards
Jon
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| John Dann wrote:
>... To be clear, I want the
> _desktop_ PC to initiate the link, in other words to send IP packets
> to the laptop and get it to do something - having the laptop initiate
> the link won't work for my scenario.
Sorry, but that isn't clear enough. What "something" do you want it to
do? Without a fixed IP it isn't easy to connect to the laptop from the
fixed PC, and I don't think that you even get a public IP, let alone a
fixed ons. But if you just want remote control, www.logmein.com has a
free solution to your requirements.
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| John Dann 2007-10-30, 12:33 pm |
| On Tue, 30 Oct 2007 10:38:56 +0000, Iain <no-one@hairydog.co.uk>
wrote:
>Sorry, but that isn't clear enough. What "something" do you want it to
>do? Without a fixed IP it isn't easy to connect to the laptop from the
>fixed PC, and I don't think that you even get a public IP, let alone a
>fixed ons. But if you just want remote control, www.logmein.com has a
>free solution to your requirements.
Actually, I was trying to simplify my aim by talking about a laptop.
What I really want to do is to talk to a serial-based instrument at a
remote location hanging off a GPRS-type modem (for example via an
RS232-to-IP device server or similar). I noticed that something like
the Billion 7300GX router will accept a GPRS-type datacard and hence
cna potentially provide a - relatively - low-cost route to creating an
RS232 tunnel across a GPRS-type radio link. It's not that one can't do
this using other kit, eg using a formal GPRS modem etc but this sort
of M2M communication seems to be jealously guarded by the networks and
their M2M specialist affiliates and consequently seems to involve
specialist expertise and high on-costs. It seems that in this respect
the mobile market is lagging substantially behind fixed-line
technology where it's fairly simple to set up such a link.
My quest is therefore still a find a mechanism that will let me set up
a serial tunnel over (eg but including any comparable protocol) GPRS
that can (i) have the tunnel initiated from the local rather than the
renote end; (ii) pass data continuously with up to 200MB/month of
bandwidth - ideally a little more - available at reasonable cost
(maybe £10-25pm but as low as possible); and (iii) be straightforward
to provision and configure. But it sounds like the technology/network
mindset still isn't quite there yet for this sort of application.
JGD
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| John Dann wrote:
>
> Actually, I was trying to simplify my aim by talking about a laptop.
Leaving essential detail out rarely simplifies things!
> What I really want to do is to talk to a serial-based instrument at a
> remote location hanging off a GPRS-type modem (for example via an
> RS232-to-IP device server or similar).
I think your easiest way is to connect it to a laptop running logmein!
Cant think of a straightforward way to do what you want otherwise.
Iaoin
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