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Use IP_DONTFRAGMENT instead of IP_MTU_DISCOVER on Windows.

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This ensures the DF bit on outgoing UDP packets gets set on Windows when path
MTU discovery is enabled, reducing fragmentation.
This commit is contained in:
Guus Sliepen 2009-10-24 22:32:35 +02:00
parent 242c4e2ca6
commit c3acae034c
1 changed files with 5 additions and 0 deletions
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5
src/net_socket.c
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@ -279,6 +279,11 @@ int setup_vpn_in_socket(const sockaddr_t *sa) {
option = IP_PMTUDISC_DO; option = IP_PMTUDISC_DO;
setsockopt(nfd, SOL_IP, IP_MTU_DISCOVER, &option, sizeof(option)); setsockopt(nfd, SOL_IP, IP_MTU_DISCOVER, &option, sizeof(option));
} }
#elif defined(IPPROTO_IP) && defined(IP_DONTFRAGMENT)
if(myself->options & OPTION_PMTU_DISCOVERY) {
option = 1;
setsockopt(nfd, IPPROTO_IP, IP_DONTFRAGMENT, &option, sizeof(option));
}
#endif #endif
#if defined(SOL_IPV6) && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO) #if defined(SOL_IPV6) && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)