Yes, correct for OpenWrt. OpenWrt defaults to dropbear for both server and client. However, more advanced users may optionally choose to replace it with OpenSSH, or install OpenSSH side-by-side, to gain additional features of OpenSSH.
I've been using a single letter "fake" tld for my internal LAN DNS zone. Looks like ICANN requires 3+ letters in tld applications, so hopefully should be safe for quite a while.
I remember setting up a new git CI build server many years ago, which at the time rather quickly started failing build pipelines in a nodejs css frontend build script, turns out there was something funky with the AMD processor's RDRAND. A motherboard BIOS flash update fixed it.
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