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It is not generally possible to send AT commands to a modem while a call is in progress. This applies to all AT-compatible modems, "regular" dial-up modems and mobile phone modems alike, and it has nothing to do with PPP. By the way, a point of terminology: PPP sessions are not mounted. Mouting and umounting are terms that apply to filesystems. There are ...


Whatever's talking directly (at layer three) to the provider gets the address the provider assigns, which is usually global. Though, if you connect a Linux box directly to a modem, then that's it.


Believe it's compiled into the kernel. grep CONFIG_SERIAL_8250_RUNTIME_UARTS /boot/config* CONFIG_SERIAL_8250_RUNTIME_UARTS=32 See Serial Tips And Miscellany Number of Serial Ports Supported If you have more than 4 (or possibly 2) serial ports, then you must insure that the kernel knows this. It can be done by configuring the kernel when compiling ...

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