I just checked, and I have connectivity while on cellular. Maybe (just wild speculation) your mobile network is IPv6-only? Android (not Linux) should list 192.0.0.4 as an IP address in that case.

Yes, Linux is running in a VM, and the network interface is a virtualized veth interface connected to a host bridge. The host android system has IP address 192.168.0.1, and this network interface is called avf_tap_fixed (as seen from termux).

While this is very exciting, I just tried it, and the network connectivity seems to be broken. No IPv6.

I met someone that was throwing out old memory modules. Literally boxes full of DDR, DDR2 modules. I got quite excited, hoping to upgrade my server’s memory. Yeah, DDR2 only goes up to 2GiB. So I am stuck with 2×2GiB. But I am only using 85% of that anyways, so it’s fine.