Files
gluetun/internal/pmtud/icmp/df_linux.go
T
Quentin McGaw be92aa2ac4 Path MTU discovery fixes and improvements (#3109)
- Existing option `WIREGUARD_MTU` , if set, disables PMTUD and is used
- New option `PMTUD_ICMP_ADDRESSES=1.1.1.1,8.8.8.8` and `PMTUD_TCP_ADDRESSES=1.1.1.1:443,8.8.8.8:443`
- ICMP PMTUD now targets external-by-default IP addresses
- New TCP PMTUD (binary search only) as a second MTU confirmation and fallback mechanism.
- Force set TCP MSS to MTU - IP header - TCP base header - "magic 20 bytes" 🎆
- Fix #3108
2026-02-14 19:40:34 -05:00

11 lines
199 B
Go

package icmp
import (
"syscall"
)
func setDontFragment(fd uintptr) (err error) {
return syscall.SetsockoptInt(int(fd), syscall.IPPROTO_IP,
syscall.IP_MTU_DISCOVER, syscall.IP_PMTUDISC_PROBE)
}