LADVDC(8)

📦 version 1.1.4, in debian bookworm, debian trixie, fedora 43, fedora 44, ubuntu jammy, ubuntu noble, ubuntu questing, ubuntu resolute, ubuntu stonking

okay bestie, gather round, because this one is from the System Manager's Manual and it is genuinely iconic. it's ladvdc, and yes, the 8 means it's a system-manager-flavoured page, so act accordingly 💅

✨ NAME ✨

ladvdc — display link layer advertisements 🦋

✨ SYNOPSIS ✨

ladvdc [ INTERFACE ] [ INTERFACE ] ...

✨ DESCRIPTION ✨

so basically ladvdc shows you the link layer advertisements that ladvd(8) received — but ONLY if that daemon is running in receive mode, which you get via -a or -z. no receive mode, no tea, no exceptions 😭

and like, you don't have to take everything it throws at you. you can optionally hand it a list of protocols and/or interfaces, and it'll limit how much info it displays. picky is cute, slay.

🚨 important vibe check: only users in the ladvd group are allowed to connect to the daemon. not your group, not your bestie's group — ladvd. periodt.

✨ OPTIONS ✨

  • -b — prints the output in a format that's suitable for dropping into shell scripts 🐚 (script girlies, this one's for you)
  • -d — dumps pcap-compatible packets to stdout, so you can pipe them into tcpdump (like, via "| tcpdump -r -") or just redirect them into a file for further analysis 📦
  • -f — prints a full decode of each advertisement. and before you get excited… it's not implemented 💀 bestie it's literally not there
  • -h — prints usage instructions 🫶 the classic
  • -o — only prints the first advertisement ✋ one and done, we love a minimalist
  • -p http://domain.tld/script — posts decoded packets to the supplied url 🌐
  • -v — increases logging verbosity 🗣️ more words, more chaos
  • -L — parses LLDP (Link Layer Discovery Protocol) 🔥
  • -C — parses CDP (Cisco Discovery Protocol) 👑
  • -E — parses EDP (Extreme Discovery Protocol) ⚡
  • -F — parses FDP (Foundry Discovery Protocol) 🏭
  • -N — parses NDP (Nortel Discovery Protocol), which used to be called SynOptics Network Management Protocol (SONMP) 🌈 — glow-up AND a rebrand, we stan

✨ AUTHOR ✨

Sten Spans <sten@blinkenlights.nl> — thank you for your service, king 🫡💜

and that's the whole page, bestie! this version of ladvdc came out on April 19, 2010 — so yeah, it's vintage, it's retro, it's giving classic system manager's manual energy, and it still ate 💅✨ mwah, go read your advertisements 🎀

📦 where this page comes from