FreeBSD's ppp(8) and u3g UMTS modem
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Many USB UMTS data sticks provide a serial port over which you can speak asynchronous PPP to the stick to establish a data connection. The hardware drivers contain more info on all functions provided, see u3g(4) et al.
Sample ppp.conf(8):
u3g: set device /dev/cuaU0.0 set speed 115200 # the stick/the network fail to provide an IP unless you suggest one, so the # following line might be necessary #set ifaddr 10.0.0.1/0 10.0.0.2/0 255.255.255.0 set authname internet set authkey internet set log local phase ipcp set dial "ABORT BUSY TIMEOUT 2 \ \"\" \ AT OK-AT-OK \ AT+CFUN=1 OK-AT-OK \ AT+CMEE=2 OK-AT-OK \ AT+CSQ OK \ AT+CGDCONT=1,\\\"IP\\\",\\\"internet\\\" OK \ AT+CGACT? OK-AT-OK \ AT+CGATT? OK \ AT+CGCLASS? OK \ AT+COPS? OK \ ATD*99***1# CONNECT" set crtscts on nat enable yes add default HISADDR #disable dns