You don't have it because it is a part of the network system drivers. The same apply for eth0 - I beleive you were wrong
saying you had it in /dev directory, unless you are using some
"prehistoric" version of the kernel.
The device you should supply as an argument to your sniffer
I beleive is the serial device to which your modem is attached
- cuaN, N={1,2,..}.
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