IP_TTL(2const)                                                  IP_TTL(2const)

NAME
       IP_TTL - time to live

LIBRARY
       Standard C library (libc, -lc)

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

       int setsockopt(int sockfd, IPPROTO_IP, IP_TTL,
                      const int *ttl, sizeof(int));
       int getsockopt(int sockfd, IPPROTO_IP, IP_TTL,
                      int *ttl, sizeof(int));

DESCRIPTION
       Set or retrieve the current time-to-live field that is used in every
       packet sent from this socket.

ERRORS
       See IPPROTO_IP(2const).  See setsockopt(2).  See ip(7).

HISTORY
       Linux 1.0.

SEE ALSO
       IPPROTO_IP(2const), setsockopt(2), ip(7)

Linux man-pages 6.17              2025-11-25                    IP_TTL(2const)