diff --git a/logging/interface.go b/logging/interface.go
index e925ba0d..0c754fd5 100644
--- a/logging/interface.go
+++ b/logging/interface.go
@@ -11,32 +11,90 @@ import (
 	"github.com/lucas-clemente/quic-go/internal/wire"
 )
 
+type (
+	// A ByteCount is used to count bytes.
+	ByteCount = protocol.ByteCount
+	// A ConnectionID is a QUIC Connection ID.
+	ConnectionID = protocol.ConnectionID
+	// The EncryptionLevel is the encryption level of a packet.
+	EncryptionLevel = protocol.EncryptionLevel
+	// The KeyPhase is the key phase of the 1-RTT keys.
+	KeyPhase = protocol.KeyPhase
+	// The PacketNumber is the packet number of a packet.
+	PacketNumber = protocol.PacketNumber
+	// The Perspective is the role of a QUIC endpoint (client or server).
+	Perspective = protocol.Perspective
+	// The StreamID is the stream ID.
+	StreamID = protocol.StreamID
+	// The StreamNum is the number of the stream.
+	StreamNum = protocol.StreamNum
+	// The StreamType is the type of the stream (unidirectional or bidirectional).
+	StreamType = protocol.StreamType
+	// The VersionNumber is the QUIC version.
+	VersionNumber = protocol.VersionNumber
+	// The Header is the QUIC packet header, before removing header protection.
+	Header = wire.Header
+	// The ExtendedHeader is the QUIC packet header, after removing header protection.
+	ExtendedHeader = wire.ExtendedHeader
+	// The TransportParameters are QUIC transport parameters.
+	TransportParameters = wire.TransportParameters
+
+	// The RTTStats contain statistics used by the congestion controller.
+	RTTStats = congestion.RTTStats
+)
+
+const (
+	// PerspectiveServer is used for a QUIC server
+	PerspectiveServer Perspective = protocol.PerspectiveServer
+	// PerspectiveClient is used for a QUIC client
+	PerspectiveClient Perspective = protocol.PerspectiveClient
+)
+
+const (
+	// EncryptionInitial is the Initial encryption level
+	EncryptionInitial EncryptionLevel = protocol.EncryptionInitial
+	// EncryptionHandshake is the Handshake encryption level
+	EncryptionHandshake EncryptionLevel = protocol.EncryptionHandshake
+	// Encryption1RTT is the 1-RTT encryption level
+	Encryption1RTT EncryptionLevel = protocol.Encryption1RTT
+	// Encryption0RTT is the 0-RTT encryption level
+	Encryption0RTT EncryptionLevel = protocol.Encryption0RTT
+)
+
+const (
+	// StreamTypeUni is a unidirectional stream
+	StreamTypeUni = protocol.StreamTypeUni
+	// StreamTypeBidi is a bidirectional stream
+	StreamTypeBidi = protocol.StreamTypeBidi
+)
+
+// A Tracer traces events.
 type Tracer interface {
-	TracerForServer(odcid protocol.ConnectionID) ConnectionTracer
-	TracerForClient(odcid protocol.ConnectionID) ConnectionTracer
+	TracerForServer(odcid ConnectionID) ConnectionTracer
+	TracerForClient(odcid ConnectionID) ConnectionTracer
 }
 
 // A ConnectionTracer records events.
 type ConnectionTracer interface {
-	StartedConnection(local, remote net.Addr, version protocol.VersionNumber, srcConnID, destConnID protocol.ConnectionID)
+	StartedConnection(local, remote net.Addr, version VersionNumber, srcConnID, destConnID ConnectionID)
 	ClosedConnection(CloseReason)
-	SentTransportParameters(*wire.TransportParameters)
-	ReceivedTransportParameters(*wire.TransportParameters)
-	SentPacket(hdr *wire.ExtendedHeader, packetSize protocol.ByteCount, ack *wire.AckFrame, frames []wire.Frame)
-	ReceivedVersionNegotiationPacket(*wire.Header)
-	ReceivedRetry(*wire.Header)
-	ReceivedPacket(hdr *wire.ExtendedHeader, packetSize protocol.ByteCount, frames []wire.Frame)
+	SentTransportParameters(*TransportParameters)
+	ReceivedTransportParameters(*TransportParameters)
+	SentPacket(hdr *ExtendedHeader, packetSize ByteCount, ack *wire.AckFrame, frames []wire.Frame)
+	ReceivedVersionNegotiationPacket(*Header)
+	ReceivedRetry(*Header)
+	ReceivedPacket(hdr *ExtendedHeader, packetSize ByteCount, frames []wire.Frame)
 	ReceivedStatelessReset(token *[16]byte)
 	BufferedPacket(PacketType)
-	DroppedPacket(PacketType, protocol.ByteCount, PacketDropReason)
-	UpdatedMetrics(rttStats *congestion.RTTStats, cwnd protocol.ByteCount, bytesInFLight protocol.ByteCount, packetsInFlight int)
-	LostPacket(protocol.EncryptionLevel, protocol.PacketNumber, PacketLossReason)
+	DroppedPacket(PacketType, ByteCount, PacketDropReason)
+	UpdatedMetrics(rttStats *RTTStats, cwnd ByteCount, bytesInFLight ByteCount, packetsInFlight int)
+	LostPacket(EncryptionLevel, PacketNumber, PacketLossReason)
 	UpdatedPTOCount(value uint32)
-	UpdatedKeyFromTLS(protocol.EncryptionLevel, protocol.Perspective)
-	UpdatedKey(generation protocol.KeyPhase, remote bool)
-	DroppedEncryptionLevel(protocol.EncryptionLevel)
-	SetLossTimer(TimerType, protocol.EncryptionLevel, time.Time)
-	LossTimerExpired(TimerType, protocol.EncryptionLevel)
+	UpdatedKeyFromTLS(EncryptionLevel, Perspective)
+	UpdatedKey(generation KeyPhase, remote bool)
+	DroppedEncryptionLevel(EncryptionLevel)
+	SetLossTimer(TimerType, EncryptionLevel, time.Time)
+	LossTimerExpired(TimerType, EncryptionLevel)
 	LossTimerCanceled()
 	// Close is called when the connection is closed.
 	Close()
diff --git a/logging/packet_header.go b/logging/packet_header.go
index abd72b06..287e0cc5 100644
--- a/logging/packet_header.go
+++ b/logging/packet_header.go
@@ -2,11 +2,10 @@ package logging
 
 import (
 	"github.com/lucas-clemente/quic-go/internal/protocol"
-	"github.com/lucas-clemente/quic-go/internal/wire"
 )
 
 // PacketTypeFromHeader determines the packet type from a *wire.Header.
-func PacketTypeFromHeader(hdr *wire.Header) PacketType {
+func PacketTypeFromHeader(hdr *Header) PacketType {
 	if !hdr.IsLongHeader {
 		return PacketType1RTT
 	}
@@ -31,13 +30,13 @@ func PacketTypeFromHeader(hdr *wire.Header) PacketType {
 type PacketHeader struct {
 	PacketType PacketType
 
-	PacketNumber  protocol.PacketNumber
-	PayloadLength protocol.ByteCount
+	PacketNumber  PacketNumber
+	PayloadLength ByteCount
 	// Size of the QUIC packet (QUIC header + payload).
 	// See https://github.com/quiclog/internet-drafts/issues/40.
-	PacketSize protocol.ByteCount
+	PacketSize ByteCount
 
-	Version          protocol.VersionNumber
-	SrcConnectionID  protocol.ConnectionID
-	DestConnectionID protocol.ConnectionID
+	Version          VersionNumber
+	SrcConnectionID  ConnectionID
+	DestConnectionID ConnectionID
 }