diff --git a/dialer/icmp/dialer.go b/dialer/icmp/dialer.go
index 194aaa1..47b385d 100644
--- a/dialer/icmp/dialer.go
+++ b/dialer/icmp/dialer.go
@@ -105,7 +105,7 @@ func (d *icmpDialer) Dial(ctx context.Context, addr string, opts ...dialer.DialO
 
 func (d *icmpDialer) initSession(ctx context.Context, addr net.Addr, conn net.PacketConn) (*quicSession, error) {
 	quicConfig := &quic.Config{
-		KeepAlivePeriod:      d.md.keepAlive,
+		KeepAlivePeriod:      d.md.keepAlivePeriod,
 		HandshakeIdleTimeout: d.md.handshakeTimeout,
 		MaxIdleTimeout:       d.md.maxIdleTimeout,
 		Versions: []quic.VersionNumber{
diff --git a/dialer/icmp/metadata.go b/dialer/icmp/metadata.go
index ccca086..8591753 100644
--- a/dialer/icmp/metadata.go
+++ b/dialer/icmp/metadata.go
@@ -8,7 +8,7 @@ import (
 )
 
 type metadata struct {
-	keepAlive        time.Duration
+	keepAlivePeriod  time.Duration
 	maxIdleTimeout   time.Duration
 	handshakeTimeout time.Duration
 }
@@ -16,13 +16,17 @@ type metadata struct {
 func (d *icmpDialer) parseMetadata(md mdata.Metadata) (err error) {
 	const (
 		keepAlive        = "keepAlive"
+		keepAlivePeriod  = "ttl"
 		handshakeTimeout = "handshakeTimeout"
 		maxIdleTimeout   = "maxIdleTimeout"
 	)
 
-	d.md.handshakeTimeout = mdx.GetDuration(md, handshakeTimeout)
-
-	d.md.keepAlive = mdx.GetDuration(md, keepAlive)
+	if mdx.GetBool(md, keepAlive) {
+		d.md.keepAlivePeriod = mdx.GetDuration(md, keepAlivePeriod)
+		if d.md.keepAlivePeriod <= 0 {
+			d.md.keepAlivePeriod = 10 * time.Second
+		}
+	}
 	d.md.handshakeTimeout = mdx.GetDuration(md, handshakeTimeout)
 	d.md.maxIdleTimeout = mdx.GetDuration(md, maxIdleTimeout)
 
diff --git a/dialer/quic/dialer.go b/dialer/quic/dialer.go
index 6988765..c01fef9 100644
--- a/dialer/quic/dialer.go
+++ b/dialer/quic/dialer.go
@@ -103,7 +103,7 @@ func (d *quicDialer) Dial(ctx context.Context, addr string, opts ...dialer.DialO
 
 func (d *quicDialer) initSession(ctx context.Context, addr net.Addr, conn net.PacketConn) (*quicSession, error) {
 	quicConfig := &quic.Config{
-		KeepAlivePeriod:      d.md.keepAlive,
+		KeepAlivePeriod:      d.md.keepAlivePeriod,
 		HandshakeIdleTimeout: d.md.handshakeTimeout,
 		MaxIdleTimeout:       d.md.maxIdleTimeout,
 		Versions: []quic.VersionNumber{
diff --git a/dialer/quic/metadata.go b/dialer/quic/metadata.go
index 70ea1f9..c1c893d 100644
--- a/dialer/quic/metadata.go
+++ b/dialer/quic/metadata.go
@@ -8,7 +8,7 @@ import (
 )
 
 type metadata struct {
-	keepAlive        time.Duration
+	keepAlivePeriod  time.Duration
 	maxIdleTimeout   time.Duration
 	handshakeTimeout time.Duration
 
@@ -18,19 +18,23 @@ type metadata struct {
 func (d *quicDialer) parseMetadata(md mdata.Metadata) (err error) {
 	const (
 		keepAlive        = "keepAlive"
+		keepAlivePeriod  = "ttl"
 		handshakeTimeout = "handshakeTimeout"
 		maxIdleTimeout   = "maxIdleTimeout"
 
 		cipherKey = "cipherKey"
 	)
 
-	d.md.handshakeTimeout = mdx.GetDuration(md, handshakeTimeout)
-
 	if key := mdx.GetString(md, cipherKey); key != "" {
 		d.md.cipherKey = []byte(key)
 	}
 
-	d.md.keepAlive = mdx.GetDuration(md, keepAlive)
+	if mdx.GetBool(md, keepAlive) {
+		d.md.keepAlivePeriod = mdx.GetDuration(md, keepAlivePeriod)
+		if d.md.keepAlivePeriod <= 0 {
+			d.md.keepAlivePeriod = 10 * time.Second
+		}
+	}
 	d.md.handshakeTimeout = mdx.GetDuration(md, handshakeTimeout)
 	d.md.maxIdleTimeout = mdx.GetDuration(md, maxIdleTimeout)
 
diff --git a/listener/icmp/listener.go b/listener/icmp/listener.go
index 8074b0e..40cf52d 100644
--- a/listener/icmp/listener.go
+++ b/listener/icmp/listener.go
@@ -59,7 +59,7 @@ func (l *icmpListener) Init(md md.Metadata) (err error) {
 	conn = admission.WrapPacketConn(l.options.Admission, conn)
 
 	config := &quic.Config{
-		KeepAlivePeriod:      l.md.keepAlive,
+		KeepAlivePeriod:      l.md.keepAlivePeriod,
 		HandshakeIdleTimeout: l.md.handshakeTimeout,
 		MaxIdleTimeout:       l.md.maxIdleTimeout,
 		Versions: []quic.VersionNumber{
diff --git a/listener/icmp/metadata.go b/listener/icmp/metadata.go
index 00c85a3..db55e89 100644
--- a/listener/icmp/metadata.go
+++ b/listener/icmp/metadata.go
@@ -12,17 +12,17 @@ const (
 )
 
 type metadata struct {
-	keepAlive        time.Duration
+	keepAlivePeriod  time.Duration
 	handshakeTimeout time.Duration
 	maxIdleTimeout   time.Duration
 
-	cipherKey []byte
-	backlog   int
+	backlog int
 }
 
 func (l *icmpListener) parseMetadata(md mdata.Metadata) (err error) {
 	const (
 		keepAlive        = "keepAlive"
+		keepAlivePeriod  = "ttl"
 		handshakeTimeout = "handshakeTimeout"
 		maxIdleTimeout   = "maxIdleTimeout"
 
@@ -34,7 +34,12 @@ func (l *icmpListener) parseMetadata(md mdata.Metadata) (err error) {
 		l.md.backlog = defaultBacklog
 	}
 
-	l.md.keepAlive = mdx.GetDuration(md, keepAlive)
+	if mdx.GetBool(md, keepAlive) {
+		l.md.keepAlivePeriod = mdx.GetDuration(md, keepAlivePeriod)
+		if l.md.keepAlivePeriod <= 0 {
+			l.md.keepAlivePeriod = 10 * time.Second
+		}
+	}
 	l.md.handshakeTimeout = mdx.GetDuration(md, handshakeTimeout)
 	l.md.maxIdleTimeout = mdx.GetDuration(md, maxIdleTimeout)
 
diff --git a/listener/quic/listener.go b/listener/quic/listener.go
index 067ba71..9b264a6 100644
--- a/listener/quic/listener.go
+++ b/listener/quic/listener.go
@@ -68,7 +68,7 @@ func (l *quicListener) Init(md md.Metadata) (err error) {
 	}
 
 	config := &quic.Config{
-		KeepAlivePeriod:      l.md.keepAlive,
+		KeepAlivePeriod:      l.md.keepAlivePeriod,
 		HandshakeIdleTimeout: l.md.handshakeTimeout,
 		MaxIdleTimeout:       l.md.maxIdleTimeout,
 		Versions: []quic.VersionNumber{
diff --git a/listener/quic/metadata.go b/listener/quic/metadata.go
index cac8596..e077ec1 100644
--- a/listener/quic/metadata.go
+++ b/listener/quic/metadata.go
@@ -12,7 +12,8 @@ const (
 )
 
 type metadata struct {
-	keepAlive        time.Duration
+	// keepAlive        bool
+	keepAlivePeriod  time.Duration
 	handshakeTimeout time.Duration
 	maxIdleTimeout   time.Duration
 
@@ -23,6 +24,7 @@ type metadata struct {
 func (l *quicListener) parseMetadata(md mdata.Metadata) (err error) {
 	const (
 		keepAlive        = "keepAlive"
+		keepAlivePeriod  = "ttl"
 		handshakeTimeout = "handshakeTimeout"
 		maxIdleTimeout   = "maxIdleTimeout"
 
@@ -39,7 +41,12 @@ func (l *quicListener) parseMetadata(md mdata.Metadata) (err error) {
 		l.md.cipherKey = []byte(key)
 	}
 
-	l.md.keepAlive = mdx.GetDuration(md, keepAlive)
+	if mdx.GetBool(md, keepAlive) {
+		l.md.keepAlivePeriod = mdx.GetDuration(md, keepAlivePeriod)
+		if l.md.keepAlivePeriod <= 0 {
+			l.md.keepAlivePeriod = 10 * time.Second
+		}
+	}
 	l.md.handshakeTimeout = mdx.GetDuration(md, handshakeTimeout)
 	l.md.maxIdleTimeout = mdx.GetDuration(md, maxIdleTimeout)