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1. Embed this notice
   Rob Ricci (ricci@discuss.systems)'s status on Monday, 30-Dec-2024 04:44:17 JST Rob Ricci

   What's one #networking fact you know that seems illegal but isn't?

   • Embed this notice
     Julius Schwartzenberg (jschwart@mas.to)'s status on Monday, 30-Dec-2024 04:44:16 JST Julius Schwartzenberg

     in reply to

     @ricci so much typing for IPv4! `ping ::1` is so much shorter ;)

   • Embed this notice
     feld (feld@friedcheese.us)'s status on Monday, 30-Dec-2024 13:46:32 JST feld

     in reply to

     • Dan Ports
     @dan @ricci you should be able to do hex too, IIRC
   • Embed this notice
     Dan Ports (dan@discuss.systems)'s status on Monday, 30-Dec-2024 13:46:33 JST Dan Ports

     in reply to

     @ricci even more cursed: don't forget that you can do this:

   • Embed this notice
     feld (feld@friedcheese.us)'s status on Monday, 30-Dec-2024 14:17:46 JST feld

     in reply to

     • Dan Ports
     @dan @ricci yes, and you can even mix different notations in the same address
   • Embed this notice
     Dan Ports (dan@discuss.systems)'s status on Monday, 30-Dec-2024 14:17:48 JST Dan Ports

     in reply to

     • feld

     @feld @ricci can we smuggle in some octal too?

   • Embed this notice
     feld (feld@friedcheese.us)'s status on Monday, 30-Dec-2024 14:24:56 JST feld

     in reply to

     • Dan Ports
     @ricci @dan it just feels like an exploit waiting to happen
   • Embed this notice
     Rob Ricci (ricci@discuss.systems)'s status on Monday, 30-Dec-2024 14:24:57 JST Rob Ricci

     in reply to

     • Dan Ports
     • feld

     @feld @dan this is the most cursed thing yet in this thread

   • Embed this notice
     Jonathan Yu (jawnsy@mastodon.social)'s status on Tuesday, 31-Dec-2024 01:09:39 JST Jonathan Yu

     in reply to

     • John Kristoff

     @jtk @ricci Does that mean port 0 is a valid port? Or is port 0 the absence of a port? What happens if you use that for the destination port?

   • Embed this notice
     feld (feld@friedcheese.us)'s status on Tuesday, 31-Dec-2024 01:09:39 JST feld

     in reply to

     • John Kristoff
     • Jonathan Yu
     @jawnsy @jtk @ricci port 0 used to actually crash network gear, was a really effective DoS vector for a while. OpenBSD's pf might have been the first firewall to drop that traffic by default
   • Embed this notice
     John Kristoff (jtk@infosec.exchange)'s status on Tuesday, 31-Dec-2024 01:09:40 JST John Kristoff

     in reply to

     @ricci The UDP source port field is optional and may be set to zero.

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     The Psychotic Network Ferret (nuintari@mastodon.bsd.cafe)'s status on Friday, 03-Jan-2025 07:02:22 JST The Psychotic Network Ferret

     in reply to

     • Dan Ports

     @dan @ricci wow, SystemD is the gift that just keeps on giving.

   • Embed this notice
     Dan Ports (dan@discuss.systems)'s status on Friday, 03-Jan-2025 07:02:23 JST Dan Ports

     in reply to

     @ricci If your NIC winds up with a sufficiently long interface name, like enp8s0f0npf0vf1, and your vlan id is high enough, you'll be unable to bring up a vlan interface like enp8s0f0npf0vf1.1024 because that exceeds the maximum interface name length (IFNAMSIZ = 16)

     sahilister repeated this.