10-02-2007, 03:51 PM
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| Junior Member | | Join Date: Sep 2009
Posts: 0
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 Re: PPPD via GPRS disconnection problem
Mikko Rapeli wrote:
> In article <61b44f09.0504080525.63a047b9@posting.google.com>, Krister
> Renaud wrote:
>> The problem:
>>
>> I start pppd, the connection comes up, if-up is run. After that I get
>> "No response to 3 echo-requests" and the link is disconnected. I have
>> tried using Fedora and an XScale linux with the same result.
> Disconnection is the problem?
> The error message is a good hint. The other end of the PPP link, most
> likely the phone you're using, does not support lcp-echo-requests and
> -replies (for really no good reason as the serial links aren't that
> reliable).
It also violates RFC 1661:
Upon reception of an Echo-Request in the LCP Opened state, an
Echo-Reply MUST be transmitted.
But cell-phone PPP is a different beast from normal PPP. I'm not
a PPP implementor and don't even have a cell-phone but believe the
following paragraph is a reasonable description of what goes on.
The PPP link terminates in the cell-phone, which has it's own PPP
implementation. The outgoing PPP data are forwarded over the RF link
using a different protocol, and the process is reversed for incoming
data from the RF link so it can be sent to the device connected to
the cell-phone using PPP.
>> lcp-echo-interval 5
>> lcp-echo-failure 3
> Setting these to zero will effectively disable echo requests and
> replies. man pppd will tell more.
Or simply remove them.
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