To have a static ip address on SUSI Linux

[sansyrox]

Describe the bug When SUSI Linux is operating in Normal mode, connected to a wifi, it has a fluctuating IP address and connecting via SSH connection makes it a tedious task.

To Reproduce Steps to reproduce the behavior:

1. Complete the SUSI installation
2. Start SUSI
3. Try to connect it via SSH
4. See error

Expected behavior To have a static IP address and improve the process of connecting to the Pi via SSH connection

Additional context Id like to work on this

[hongquan]

If someone wants to SSH to RPi without trouble of fluctuating IP address, he/she should either:

• Use RPi's mDNS domain name raspberrypi.local instead of IP address. Linux laptop should be installed these packages libnss-mdns, avahi-daemon, which are already pre-included in major distros (Ubuntu, Fedora).

• Configure his/her home router to assign fix IP for RPi (based on MAC address).

Note: Don't set static IP in RPi itself, which makes RPi not portable.

Explanation: If you set static IP 192.168.1.10, for example, in RPi (/etc/network/interfaces file), that RPi will not be usable when moved to other LAN network, because:

• New network may be in different subnet, 192.168.0.x, for example.
• The RPi's static IP may be conflict with an IP managed by that network's DHCP server. DHCP server doesn't know that RPi takes 192.168.1.10 and it tries to give that IP to another client machine and that makes both machines not work.

[sansyrox]

Okay @hongquan , makes sense. We should then add these ways in the documentation for easy access.

[hongquan]

I added a wiki here: https://github.com/fossasia/susi_linux/wiki/Connect-to-RPi-with-a-fixed-address