[deaddabe]

At $internship I developed a network router with something like 32 or 64 MiB of RAM. Basically configuring iptables, some routes, QoS, etc.. with a bunch of bash scripts, systemd units and custom drivers.

You do not need a lot of RAM for such applications. When running, the system was using 24 MiB of RAM. So, plenty left!

Edit: I am currently playing with NanoPi Neo that has 128 MiB of RAM and I never ran out of for small applications.