ISOTPTUN(1)

📦
version 2023.03 · 3 versions
, in ubuntu resolute, ubuntu stonking

💖 ISOTPTUN(1) 💖

okay bestie, sit down, hydrate, because today we're talking about isotptun — that's the manual page for isotptun version 2023.03-1build1, and honestly? it's giving tunnel girlie and I'm obsessed. 🫶

✨ NAME ✨

isotptun — the manual page for isotptun 2023.03-1build1, and yes she's iconic for having her own manpage, periodt. 👑

🌸 SYNOPSIS 🌸

isotptun [options] <CAN interface>

that's it. that's the whole vibe. options go in, a CAN interface goes in, magic comes out. ✨

🦋 DESCRIPTION 🦋

so like, isotptun is an IP over CAN ISO-TP (ISO15765-2) tunnel — a proof-of-concept, no cap. it's a whole experiment and it ate. 💅

what it actually does: it creates a Linux tunnel netdevice called ctunX, and then it transfers the ethernet frames inside ISO15765-2 (unreliable) datagrams on CAN. yes, unreliable. she said "we move anyway." 🔥

🎀 OPTIONS 🎀

  • -s <can_id> — the source can_id, bestie. if you're using extended IDs, use 8 digits. don't be shy with the digits. 📏
  • -d <can_id> — the destination can_id. same rule: 8 digits for extended IDs. 👯
  • -n <name> — name of the created IP netdevice. default is 'ctun%d', because %d is the main character here. 🌟
  • -x <addr>[:<rxaddr>] — extended addressing, and optionally a separate rxaddr. the : is doing the heavy lifting, iykyk. ✂️
  • -L <mtu>:<tx_dl>:<tx_flags> — link layer options for CAN FD. three colons-separated values, one slay. 🚀
  • -p [tx]:[rx] — set and enable tx/rx padding bytes. both colons optional, just like your plans for the weekend. 🤷
  • -P <mode> — check rx padding for (l)ength, (c)ontent, or (a)ll. pick your fighter. 🥊
  • -t <time ns> — transmit time in nanosecs. nanoseconds!! we're precise in this house. ⏱️
  • -b <bs> — blocksize. 0 = off. off is a valid lifestyle. 💤
  • -m <val> — STmin in ms/ns. see spec, bestie, I can't do everything for you. 📖
  • -w <num> — max. wait frame transmissions. the limit is real. 🚧
  • -D — daemonize to background when the tun device is created. she needs her alone time. 🌙
  • -h — half duplex mode. sharing is caring, but only one direction at a time. 🙈
  • -v — verbose mode. prints symbols for tunneled msgs, so you can see everything and be nosy. 🔍

💜 THE HEX THING 💜

CAN IDs and addresses are given and expected in hexadecimal values. that's not a suggestion, that's the law. 🚨

so for example, to create a point-to-point IP connection on CAN, you'd do:

ifconfig ctun0 123.123.123.1 pointopoint 123.123.123.2 up

look at her go. ctun0 said "I'm up" and meant it. 🌈

no cap, that ifconfig line is the whole plot twist. copy it exactly, don't freestyle the addresses. 😭

well bestie, that's the whole page 💖 sending you off with isotptun 2023.03-1build1, dated December 2025, manual section ISOTPTUN(1). go tunnel something cute, drink some water, and remember: hexadecimal is just numbers with extra sparkle. ✨🎀🦋

📦 where this page comes from