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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | ERRORS | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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IP_MTU(2const) IP_MTU(2const)
IP_MTU - path maximum transmission unit size
Standard C library (libc, -lc)
#include <netinet/in.h> /* Definition of IP* constants */
#include <sys/socket.h>
int getsockopt(int sockfd, IPPROTO_IP, IP_MTU,
int *val, sizeof(int));
Retrieve the current known path MTU of the current socket.
IP_MTU is valid only for getsockopt(2), and can be employed only
when the socket has been connected.
See IPPROTO_IP(2const). See getsockopt(2). See ip(7).
Linux.
Linux 2.2.
IPPROTO_IP(2const), getsockopt(2), ip(7)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
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⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
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Linux man-pages 6.18 2025-11-25 IP_MTU(2const)
Pages that refer to this page: IP_MTU_DISCOVER(2const), IPPROTO_IP(2const)
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HTML rendering created 2026-05-24 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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