I’ve worked in networking a good while and have a draft blog post on just this subject - but it’ll probably stay draft a bit longer. 🙂

My four main book recommendations are:

1. High Performance Browser Networking (available for free online https://hpbn.co) - great crash course on protocols and browsers. This is probably 90% of what most software developers need to know.
2. Interconnections by Radia Perlman - if you want to learn about routing protocols, this is still the best resource. Perlman is extremely accomplished in the field and has an accessible writing style. A few newer protocols will be missing, but this will give you the basis you need to pick those up easily from eg. wikipedia
3. Network Routing by Deep Medhi and Karthik Ramasamy - I only recommend this for the chapter on hardware, and possibly the chapter on label switching. It has a great overview of how a physical router is actually put together and works, but I found most of the rest of the book extremely dry and nowhere near as engaging as Perlman.
4. The Internet Peering Playbook (much of the content is free at drpeering.net) - if you want to understand the people/business rather than the technical side of how the Internet is put together

for ipv6 hurricane electrics IPv6 Certifications is nice, you even get a free shirt ;)

There was a thread a couple days ago on socket programming and networking in general with some pretty good recommendations

I’d give Tanenbaum’s Computer Networks a shot, for 2 reasons (I didn’t read it).

• I loved Operating Systems and how it was written
• I didn’t like Kurose’s book on Networking that was our official book at university
  • I probably have to add that I wasn’t a total beginner when I took this networking course, I had been working as developer for years already, so a lot of the material wasn’t new to me. I simply didn’t like the presentation.

Also Beej’s guide to network programming.

There’s a few points to add, though

• if the revision of the book is “kinda” old: TCP/IP didn’t change except for specifics, still read these books
• top layers have changed, but it’s absolutely fine to e.g. learn about HTTP/1.1 and then additionally, later read about HTTP2
• iirc there’s not much about P2P networking, but it builds on the basics
• “carrier-grade” routing like BGP or OSPF might be seen as mandatory by some, but I’d still call it advanced and so you should probably postpone this. Also the chances might be low you ever need it, if all you do is administering stuff “in a building” or “inside the data center” :)

I’m not very experienced at networking either, but using Wireshark to see what’s going on was very illustrative when I did it years ago (although I suspect that with the whole HTTPS thing going on, it might be more difficult to peek into packages?… Not sure).

The oldie, but goodie is “TCP/IP Illustrated” by Richard Stevens. It finally got networking clicking for me, and later editions are quite good too.

I share some links I collected on networking

I would recommend Networking for Systems Administrators it’s great introduction into Networking.