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Path MTU discovery fixes and improvements (#3109)

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- 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
This commit is contained in:
Quentin McGaw
2026-02-15 01:40:34 +01:00
committed by GitHub
parent 8f1fda7646
commit be92aa2ac4
59 changed files with 2050 additions and 376 deletions
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internal/configuration/settings/wireguard.go
+10 -15
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@@ -38,15 +38,9 @@ type Wireguard struct {
Interface string `json:"interface"`
PersistentKeepaliveInterval *time.Duration `json:"persistent_keep_alive_interval"`
// Maximum Transmission Unit (MTU) of the Wireguard interface.
// It cannot be zero in the internal state, and defaults to
// 1320. Note it is not the wireguard-go MTU default of 1420
// because this impacts bandwidth a lot on some VPN providers,
// see https://github.com/qdm12/gluetun/issues/1650.
// It has been lowered to 1320 following quite a bit of
// investigation in the issue:
// https://github.com/qdm12/gluetun/issues/2533.
// Note this should now be replaced with the PMTUD feature.
MTU uint32 `json:"mtu"`
// It cannot be nil in the internal state, and defaults to
// 0 indicating to use PMTUD.
MTU *uint32 `json:"mtu"`
// Implementation is the Wireguard implementation to use.
// It can be "auto", "userspace" or "kernelspace".
// It defaults to "auto" and cannot be the empty string
@@ -195,8 +189,7 @@ func (w *Wireguard) setDefaults(vpnProvider string) {
w.AllowedIPs = gosettings.DefaultSlice(w.AllowedIPs, defaultAllowedIPs)
w.PersistentKeepaliveInterval = gosettings.DefaultPointer(w.PersistentKeepaliveInterval, 0)
w.Interface = gosettings.DefaultComparable(w.Interface, "wg0")
const defaultMTU = 1320
w.MTU = gosettings.DefaultComparable(w.MTU, defaultMTU)
w.MTU = gosettings.DefaultPointer(w.MTU, 0)
w.Implementation = gosettings.DefaultComparable(w.Implementation, "auto")
}
@@ -232,7 +225,11 @@ func (w Wireguard) toLinesNode() (node *gotree.Node) {
}
interfaceNode := node.Appendf("Network interface: %s", w.Interface)
interfaceNode.Appendf("MTU: %d", w.MTU)
if *w.MTU == 0 {
interfaceNode.Append("MTU: use path MTU discovery")
} else {
interfaceNode.Appendf("MTU: %d", *w.MTU)
}
if w.Implementation != "auto" {
node.Appendf("Implementation: %s", w.Implementation)
@@ -273,11 +270,9 @@ func (w *Wireguard) read(r *reader.Reader) (err error) {
return err
}
mtuPtr, err := r.Uint32Ptr("WIREGUARD_MTU")
w.MTU, err = r.Uint32Ptr("WIREGUARD_MTU")
if err != nil {
return err
} else if mtuPtr != nil {
w.MTU = *mtuPtr
}
return nil
}