==== Connect a Computer with Raspberry Pi over IP using a USB serial line ====

\\
Ever wandered you can **connect 2 computers** over a simple **serial line** to use the **IP protocol**?
\\
This is how the whole internet works, basically, but in your small setup :)

In our example, the **Raspberry Pi is our router** (the one with routing to internet, and any other services), and the **other computer** is just a **slave** who wants access to this.

So, the sample code snippets do as follow:
<code bash>
# on the rpi
slattach -p cslip -s 115200 /dev/ttyS0 &
ifconfig sl0 192.168.60.1 pointtopoint 192.168.60.2 up

# on the pc
ps aux | grep [s]lattach | grep -i ttyusb | awk '{print $2}' | \
    xargs -r --replace=PID kill -9 PID >/dev/null 2>&1
ifconfig sl0 down >/dev/null 2>&1
(slattach -p cslip -s 115200 /dev/ttyUSB* &) >/dev/null 2>&1
sleep 2 && ifconfig sl0 192.168.60.2 pointtopoint 192.168.60.1 up
ip route del default >/dev/null 2>&1
ip route add default via 192.168.60.1

</code>
\\
Where **192.168.60.1** is the IP of our **gateway** (in this case the rpi), and **192.168.60.2** is just our serial line **client in the other side** (the pc)

Source: https://www.linuxjournal.com/article/2820