pppOverSerialRadio

http://www.tldp.org/HOWTO/PPP-HOWTO/direct.html

sudo pppd -detach crtscts lock defaultroute 10.42.42.41:10.42.42.42 /dev/cu.usbserial-A9014CRC 57600

sudo pppd -detach crtscts lock proxyarp 10.42.42.41:10.42.42.42 /dev/cu.usbserial-AM026521 57600 debug

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http://elinux.org/RPi_Serial_Connection

sudo pppd -detach noauth defaultroute /dev/cu.usbserial-A9014CRC 57600 10.42.42.41:10.42.42.42 passive local maxfail 0 nocrtscts xonxoff

sudo pppd -detach noauth proxyarp /dev/cu.usbserial-AM026521 57600 10.42.42.41:10.42.42.42 passive local maxfail 0 nocrtscts xonxoff