[ltp] Modem UMTS

[Andrew Barr]

On Sun, 2006-08-13 at 19:20 +0200, Carles Pina i Estany wrote:
> the device is USB modem, so i have to use ttyUSB*. I can dial and nearly
> to establish the connection, but not finished. ppp0 doesn't appears, so
> is not a resolv.conf problem, etc.

I use my cellphone in a similar manner via Bluetooth (and USB some
times). On my provider (Verizon Wireless), there are no terminal
prompts, it launches straight into a PPP session, using PAP or CHAP (not
sure which) for authentication. This seemed to confuse some dialing
software at the default settings. Your dialler may be expecting to do a
terminal chat session before starting PPP.

Also, when you do get it working, watch out for the LCP echo termination
feature of pppd. My provider does not respond to LCP echo requests, and
by default after four failed requests pppd (on Debian at least) will
assume the connection is dead and hang up. Until I figured this out my
sessions inexplicably lasted only two minutes (echo requests were sent
out at 30-second intervals). See /etc/ppp/options to disable this.

HTH,
Andrew