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   niconiconi (niconiconi@mk.absturztau.be)'s status on Wednesday, 23-Oct-2024 22:25:32 JST niconiconi

   TIL IP address 0 in a subnet is reserved because 4.2BSD once used it as a broadcast address, it stopped being a thing even in 4.3BSD, but everyone copied 4.3BSD so it remains reserved today.

   • Haelwenn /элвэн/ :triskell: and Puniko ? like this.
   • Embed this notice
     niconiconi (niconiconi@mk.absturztau.be)'s status on Wednesday, 23-Oct-2024 22:56:48 JST niconiconi

     in reply to

     • Sigma

     @sigmasternchen@comfy.social RFC 1122 https://datatracker.ietf.org/doc/html/rfc1122IP addresses are not permitted to have the value 0 or -1 for any of the <Host-number>, <Network-number>, or <Subnet-number> fields [...] There is a class of hosts (4.2BSD Unix and its derivatives, but not 4.3BSD) that use non-standard broadcast address forms, substituting 0 for -1.

   • Embed this notice
     Sigma (sigmasternchen@comfy.social)'s status on Wednesday, 23-Oct-2024 22:56:49 JST Sigma

     in reply to

     @niconiconi@mk.absturztau.be Interesting, I've never heard of that. Do you happen to have a link or something?

     Haelwenn /элвэн/ :triskell: repeated this.