diff --git a/shadowaead_2022/protocol.go b/shadowaead_2022/protocol.go
index fcb2f96..70a9763 100644
--- a/shadowaead_2022/protocol.go
+++ b/shadowaead_2022/protocol.go
@@ -566,11 +566,11 @@ func (c *clientPacketConn) ReadPacket(buffer *buf.Buffer) (M.Socksaddr, error) {
 	}
 
 	if sessionId == c.session.remoteSessionId {
-		if !c.session.filter.ValidateCounter(packetId, math.MaxUint64) {
+		if !c.session.filter.ValidateCounter(packetId) {
 			return M.Socksaddr{}, ErrPacketIdNotUnique
 		}
 	} else if sessionId == c.session.lastRemoteSessionId {
-		if !c.session.lastFilter.ValidateCounter(packetId, math.MaxUint64) {
+		if !c.session.lastFilter.ValidateCounter(packetId) {
 			return M.Socksaddr{}, ErrPacketIdNotUnique
 		}
 		remoteCipher = c.session.lastRemoteCipher
@@ -589,7 +589,7 @@ func (c *clientPacketConn) ReadPacket(buffer *buf.Buffer) (M.Socksaddr, error) {
 		}
 		c.session.remoteSessionId = sessionId
 		c.session.remoteCipher = remoteCipher
-		c.session.filter.ValidateCounter(packetId, math.MaxUint64)
+		c.session.filter.ValidateCounter(packetId)
 	}
 
 	var clientSessionId uint64
diff --git a/shadowaead_2022/service.go b/shadowaead_2022/service.go
index e365bf3..ef20bd4 100644
--- a/shadowaead_2022/service.go
+++ b/shadowaead_2022/service.go
@@ -361,7 +361,7 @@ returnErr:
 	return err
 
 process:
-	if !session.filter.ValidateCounter(packetId, math.MaxUint64) {
+	if !session.filter.ValidateCounter(packetId) {
 		err = ErrPacketIdNotUnique
 		goto returnErr
 	}
diff --git a/shadowaead_2022/service_multi.go b/shadowaead_2022/service_multi.go
index 0d566e2..549d2ca 100644
--- a/shadowaead_2022/service_multi.go
+++ b/shadowaead_2022/service_multi.go
@@ -299,7 +299,7 @@ returnErr:
 	return err
 
 process:
-	if !session.filter.ValidateCounter(packetId, math.MaxUint64) {
+	if !session.filter.ValidateCounter(packetId) {
 		err = ErrPacketIdNotUnique
 		goto returnErr
 	}
diff --git a/shadowaead_2022/wg_replay/replay.go b/shadowaead_2022/wg_replay/replay.go
index 19e93ce..187c2c2 100644
--- a/shadowaead_2022/wg_replay/replay.go
+++ b/shadowaead_2022/wg_replay/replay.go
@@ -26,18 +26,9 @@ type Filter struct {
 	ring [ringBlocks]block
 }
 
-// Reset resets the filter to empty state.
-func (f *Filter) Reset() {
-	f.last = 0
-	f.ring[0] = 0
-}
-
 // ValidateCounter checks if the counter should be accepted.
 // Overlimit counters (>= limit) are always rejected.
-func (f *Filter) ValidateCounter(counter, limit uint64) bool {
-	if counter >= limit {
-		return false
-	}
+func (f *Filter) ValidateCounter(counter uint64) bool {
 	indexBlock := counter >> blockBitLog
 	if counter > f.last { // move window forward
 		current := f.last >> blockBitLog