Fix bridge MTU

protocol/bridge/backend_darwin.go

@@ -23,12 +23,6 @@ var (
 	bridgeInet6LocalBase = netip.MustParseAddr("2001:db8:1::1")
 )
 
-// The darwin forwarding path silently drops frames larger than the outgoing
-// interface MTU (no ICMP, no counter), and virtualized ingress interfaces
-// (vmnet LRO) deliver TCP frames coalesced far beyond their own 1500 MTU, so
-// the bridge tun must accept full-size IP packets.
-const bridgeTunMTU = 0xffff
-
 type backendDarwin struct {
 	backendBase
 

protocol/bridge/backend_linux.go

@@ -20,8 +20,6 @@ import (
 const (
 	defaultBridgeRuleIndex      = 100
 	defaultBridgeTableIndexBase = 2200
-
-	bridgeTunMTU = 1500
 )
 
 type backendLinux struct {

protocol/bridge/packet.go

@@ -13,6 +13,7 @@ import (
 )
 
 const (
+	bridgeTunMTU         = 0xffff
 	maxPacketLength      = 0xffff
 	bridgeMaxInstances   = 254
 	bridgeWriteBatchSize = 32

protocol/bridge/packet_windows.go

@@ -1,5 +0,0 @@
-//go:build windows && (amd64 || 386)
-
-package bridge
-
-const bridgeTunMTU = 1500