diff --git a/hub/handlers.go b/hub/handlers.go
index 6c332e2..41159a3 100644
--- a/hub/handlers.go
+++ b/hub/handlers.go
@@ -31,7 +31,7 @@ func (a *App) _signin(s *api.Session, w http.ResponseWriter, r *http.Request) er
 func (a *App) _signinSubmit(s *api.Session, w http.ResponseWriter, r *http.Request) error {
 	host, _, _ := net.SplitHostPort(r.RemoteAddr)
 	if !a.signInLock.TryLock(host) {
-		time.Sleep(time.Duration(rand.Int64N(int64(4 * time.Second))))
+		time.Sleep(time.Second + time.Duration(rand.Int64N(int64(3*time.Second))))
 		return errs.ErrNotAuthorized
 	}
 	defer a.signInLock.Unlock(host)
diff --git a/peer/control/ping.go b/peer/control/ping.go
index 68f9957..f188d23 100644
--- a/peer/control/ping.go
+++ b/peer/control/ping.go
@@ -73,12 +73,12 @@ func Unmarshal(buf [Size]byte) (Ping, error) {
 	}
 
 	addr := netip.AddrFrom4([4]byte(buf[9:13]))
-	if !addr.IsUnspecified() && addr.Is4() {
+	if !addr.IsUnspecified() {
 		p.SrcV4 = netip.AddrPortFrom(addr, binary.BigEndian.Uint16(buf[13:15]))
 	}
 
 	addr = netip.AddrFrom16([16]byte(buf[15:31])).Unmap()
-	if !addr.IsUnspecified() && addr.Is6() {
+	if !addr.IsUnspecified() {
 		p.SrcV6 = netip.AddrPortFrom(addr, binary.BigEndian.Uint16(buf[31:33]))
 	}