[coddle-hark]

No OP but I think there’s three parts to really getting TCP/IP:

- Read the spec(s)

- Learn the OS APIs deeply

- Look at a bunch of real network data in e.g. Wireguard

[OJFord]

> Look at a bunch of real network data in e.g. Wireguard

I think you probably meant data in e.g. Wireshark?

But another good suggestion (or maybe what you meant) might be to look at 'real' (production) networking code in e.g. Wireguard, I imagine.