@p >It's GPL.
No, it isn't "any license in the GPL family".

Its own developers note that some parts are GPLv2-only and other parts are under other license despite how daft such a claim is.

One example is this proprietary software, consisting of microprocessor instructions with no source code; https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/powerpc/platforms/8xx/micropatch.c#n43

Although it has "// SPDX-License-Identifier: GPL-2.0" on the top, that is not the license as reviewing the git log, that was added via a script.

>I haven't even tried to get the proprietary firmware blobs across the network.
I wasn't referring to the proprietary peripheral software derivative works updated in lockstep in the oh so "separate" "linux-firmware.

>If IPv4 packets are not being routed to the internet, your network is broken.
That's a big claim.

Some networks are IPv6-only and pretty much every endpoint on the internet can be reached from there except for broken endpoints that don't support IPv6.

Your network is broken if it doesn't implement IPv6 and if it implements legacy IP, that's using it via a broken method unless you're using IPv4 without NAT as it was designed to work (I've noticed that IPv4 actually works semi-decently without NAT, although not as well as IPv6).