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#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
int sock_set_dontfrag(int sock,int val)
#if defined IP_MTU_DISCOVER && defined IP_PMTUDISC_DONT
int mtu_type;
if (val)
mtu_type = IP_PMTUDISC_DO;
mtu_type = IP_PMTUDISC_WANT;
return setsockopt(sock, SOL_IP, IP_MTU_DISCOVER, &mtu_type, sizeof (mtu_type));
#elif defined IP_DONTFRAG
const int opt = val;
return setsockopt(sock, IPPROTO_IP, IP_DONTFRAG, &opt, sizeof (opt));