increase initial packet size to 1280 bytes (for both IPv4 and IPv6) (#4500)

mtu_discoverer.go

@@ -1,7 +1,6 @@
 package quic
 
 import (
-	"net"
 	"time"
 
 	"github.com/quic-go/quic-go/internal/ackhandler"
@@ -27,20 +26,6 @@ const (
 	mtuProbeDelay = 5
 )
 
-func getMaxPacketSize(addr net.Addr) protocol.ByteCount {
-	maxSize := protocol.ByteCount(protocol.MinInitialPacketSize)
-	// If this is not a UDP address, we don't know anything about the MTU.
-	// Use the minimum size of an Initial packet as the max packet size.
-	if udpAddr, ok := addr.(*net.UDPAddr); ok {
-		if utils.IsIPv4(udpAddr.IP) {
-			maxSize = protocol.InitialPacketSizeIPv4
-		} else {
-			maxSize = protocol.InitialPacketSizeIPv6
-		}
-	}
-	return maxSize
-}
-
 type mtuFinder struct {
 	lastProbeTime time.Time
 	mtuIncreased  func(protocol.ByteCount)