IPV6_MTU_DISCOVER(2const)

✨ IPV6_MTU_DISCOVER 💖

okay bestie, so this is a page from the Linux man-pages, section 2const — the constants girlies. Today's main character: IPV6_MTU_DISCOVER, aka path maximum transfer unit size discovery ✨ like… it's literally the setting that decides how your socket figures out the biggest packet it can yeet across the path without getting shredded into fragments. no cap.

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📚 LIBRARY

Standard C library (libc, -lc) 🫶

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🎀 SYNOPSIS

#include <netinet/in.h>  /* Definition of IP* constants */
#include <sys/socket.h>

int setsockopt(int sockfd, IPPROTO_IPV6, IPV6_MTU_DISCOVER,
               const int *val, sizeof(int));
int getsockopt(int sockfd, IPPROTO_IPV6, IPV6_MTU_DISCOVER,
               int *val, sizeof(int));

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🦋 DESCRIPTION

So basically: set it, or receive it. This is your Path MTU Discovery setting for a socket 💅 one socket, one vibe check, one MTU discovery mode.

That's it. That's the whole description. She's short, she's iconic, she says exactly what she needs to say and leaves. 👑

For the actual details of the setting itself, go read IP_MTU_DISCOVER(2const) — that's where the lore lives, fr fr.

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😭 ERRORS

Everything that can go wrong here is documented elsewhere, babes:

• See IPPROTO_IPV6(2const).
• See setsockopt(2).
• See ipv6(7).

not me sending you on a little reading quest 💀 but that's just how the constants pages work — the errors live with the family, iykyk.

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👀 SEE ALSO

• IPPROTO_IPV6(2const)
• setsockopt(2)
• ipv6(7)

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and that's the whole page, bestie 🍓 go forth and discover your path MTU responsibly ✨

this lil cutie is from Linux man-pages 6.20, dated 2025-12-02 🎀 mwah, stan, periodt 💅🦋