| Author |
Message |
Rocky
Guest
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 Posted:
Wed Dec 28, 2005 9:15 am Post subject:
ppp implementation over GPRS |
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Hi All,
I am trying to implement PPP. I appear to be getting as far as the PAP,
but then the server just waits for about 10 seconds and disconnects
unless I 'poke' it with a request for an IP address. This suggests that
I haven't actually done enough LCP to get to the NCP phase.
Any ideas or references?
Regards
Rocky |
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Didi
Guest
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| Posted:
Wed Dec 28, 2005 9:15 am Post subject:
Re: ppp implementation over GPRS |
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I am not sure there was such a thing like "too few" LCP options (but
last time I did ppp was > year ago). If you get an IP in reply to your
request, things seem pretty much normal - the other side may well
assume a 10 seconds timeout, i.e. if you did not request (or state)
an IP address, something is assumed to have gone wrong on either side.
As for references, those I used you obviously already have
(rfc1661 1662 etc :-). Good luck with your implementaton.
Dimiter
------------------------------------------------------
Dimiter Popoff Transgalactic Instruments
http://www.tgi-sci.com
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Didi
Guest
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| Posted:
Wed Dec 28, 2005 9:15 am Post subject:
Re: ppp implementation over GPRS |
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This occured to me after posting my former reply.
There can actually be "too few" LCP options - namely 0.
Both sides must have received a "configure-ack" before
you can move further form the LCP stage.
Dimiter
------------------------------------------------------
Dimiter Popoff Transgalactic Instruments
http://www.tgi-sci.com
------------------------------------------------------ |
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Rocky
Guest
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| Posted:
Wed Dec 28, 2005 9:15 am Post subject:
Re: ppp implementation over GPRS |
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Didi wrote:
| Quote: | I am not sure there was such a thing like "too few" LCP options (but
last time I did ppp was > year ago). If you get an IP in reply to your
request, things seem pretty much normal - the other side may well
assume a 10 seconds timeout, i.e. if you did not request (or state)
an IP address, something is assumed to have gone wrong on either side.
As for references, those I used you obviously already have
(rfc1661 1662 etc :-). Good luck with your implementaton.
|
Hi Didi,
thanks - I have read thru the RFCs, but I must admit was trying to hack
some code to get it going quickly. The thing is that when I do an
ethereal trace off a setup on my PC the server _offers_ its IP address
after authentication and then the PC negotiates for its IP by
requesting '0.0.0.0'. In my implementation I don't get the intial
offer. Also, because I'm on a private APN I should be getting a
specific IP, but I actually get some othe IP - as if I haven't logged
in properly. I suppose that is a major clue!
Regards - Rocky |
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Rocky
Guest
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| Posted:
Thu Dec 29, 2005 1:15 am Post subject:
Re: ppp implementation over GPRS |
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Rocky wrote:
| Quote: | Didi wrote:
I am not sure there was such a thing like "too few" LCP options (but
last time I did ppp was > year ago). If you get an IP in reply to your
|
Hi Didi - thanks for input. The problem was that is was not doing the
ATD command correctly. ATD*99# connects using 'internal default
settings' and does not default to the setting that I had set up. I had
to change to ATD*99**ppp*1# and then I got the correct IP address.
Regards - Rocky |
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