diff --git a/client-ctl.go b/client-ctl.go
index f68dcd9..5f92945 100644
--- a/client-ctl.go
+++ b/client-ctl.go
@@ -182,7 +182,7 @@ func (ctl *client_ctl_client_conns) ServeHTTP(w http.ResponseWriter, req *http.R
 						ClientPeerName: r.peer_name,
 						ServerPeerListenAddr: r.server_peer_listen_addr.String(),
 						ServerPeerNet: r.server_peer_net,
-						ServerPeerOption: r.server_peer_option.string(),
+						ServerPeerOption: r.server_peer_option.String(),
 						Lifetime: fmt.Sprintf("%.09f", r.lifetime.Seconds()),
 						LifetimeStart: r.lifetime_start.Unix(),
 					})
@@ -295,7 +295,7 @@ func (ctl *client_ctl_client_conns_id) ServeHTTP(w http.ResponseWriter, req *htt
 					ClientPeerName: r.peer_name,
 					ServerPeerListenAddr: r.server_peer_listen_addr.String(),
 					ServerPeerNet: r.server_peer_net,
-					ServerPeerOption: r.server_peer_option.string(),
+					ServerPeerOption: r.server_peer_option.String(),
 					Lifetime: fmt.Sprintf("%.09f", r.lifetime.Seconds()),
 					LifetimeStart: r.lifetime_start.Unix(),
 				})
@@ -373,7 +373,7 @@ func (ctl *client_ctl_client_conns_id_routes) ServeHTTP(w http.ResponseWriter, r
 					ClientPeerName: r.peer_name,
 					ServerPeerListenAddr: r.server_peer_listen_addr.String(),
 					ServerPeerNet: r.server_peer_net,
-					ServerPeerOption: r.server_peer_option.string(),
+					ServerPeerOption: r.server_peer_option.String(),
 					Lifetime: fmt.Sprintf("%.09f", r.lifetime.Seconds()),
 					LifetimeStart: r.lifetime_start.Unix(),
 				})
@@ -508,7 +508,7 @@ func (ctl *client_ctl_client_conns_id_routes_id) ServeHTTP(w http.ResponseWriter
 				ClientPeerName: r.peer_name,
 				ServerPeerListenAddr: r.server_peer_listen_addr.String(),
 				ServerPeerNet: r.server_peer_net,
-				ServerPeerOption: r.server_peer_option.string(),
+				ServerPeerOption: r.server_peer_option.String(),
 				Lifetime: r.lifetime.String(),
 			})
 			if err != nil { goto oops }
@@ -613,7 +613,7 @@ func (ctl *client_ctl_client_conns_id_routes_spsp) ServeHTTP(w http.ResponseWrit
 				ClientPeerName: r.peer_name,
 				ServerPeerListenAddr: r.server_peer_listen_addr.String(),
 				ServerPeerNet: r.server_peer_net,
-				ServerPeerOption: r.server_peer_option.string(),
+				ServerPeerOption: r.server_peer_option.String(),
 				Lifetime: r.lifetime.String(),
 			})
 			if err != nil { goto oops }
diff --git a/hodu.go b/hodu.go
index ae3f025..b8e024b 100644
--- a/hodu.go
+++ b/hodu.go
@@ -53,7 +53,7 @@ func TcpAddrStrClass(addr string) string {
 		ap, err = netip.ParseAddrPort(addr)
 		if err == nil {
 			if ap.Addr().Is6() { return "tcp6" }
-			if ap.Addr().Is4() { return "tcp4" }
+			if ap.Addr().Is4() || ap.Addr().Is4In6() { return "tcp4" }
 		}
 	}
 
@@ -61,7 +61,9 @@ func TcpAddrStrClass(addr string) string {
 }
 
 func TcpAddrClass(addr *net.TCPAddr) string {
-	if addr.AddrPort().Addr().Is4() {
+	var netip_addr netip.Addr
+	netip_addr = addr.AddrPort().Addr()
+	if netip_addr.Is4() || netip_addr.Is4In6() {
 		return "tcp4"
 	} else {
 		return "tcp6"
@@ -103,7 +105,7 @@ func string_to_route_option(desc string) RouteOption {
 	return option
 }
 
-func (option RouteOption) string() string {
+func (option RouteOption) String() string {
 	var str string
 	str = ""
 	if option & RouteOption(ROUTE_OPTION_TCP6)  != 0 { str += " tcp6" }
diff --git a/server-ctl.go b/server-ctl.go
index 3b5e94f..9821725 100644
--- a/server-ctl.go
+++ b/server-ctl.go
@@ -102,7 +102,7 @@ func (ctl *server_ctl_server_conns) ServeHTTP(w http.ResponseWriter, req *http.R
 						ClientPeerName: r.PtcName,
 						ServerPeerServiceAddr: r.SvcAddr.String(),
 						ServerPeerServiceNet: r.SvcPermNet.String(),
-						ServerPeerOption: r.SvcOption.string(),
+						ServerPeerOption: r.SvcOption.String(),
 					})
 				}
 				js = append(js, json_out_server_conn{
@@ -169,7 +169,7 @@ func (ctl *server_ctl_server_conns_id) ServeHTTP(w http.ResponseWriter, req *htt
 					ClientPeerName: r.PtcName,
 					ServerPeerServiceAddr: r.SvcAddr.String(),
 					ServerPeerServiceNet: r.SvcPermNet.String(),
-					ServerPeerOption: r.SvcOption.string(),
+					ServerPeerOption: r.SvcOption.String(),
 				})
 			}
 			js = &json_out_server_conn{
@@ -234,7 +234,7 @@ func (ctl *server_ctl_server_conns_id_routes) ServeHTTP(w http.ResponseWriter, r
 					ClientPeerName: r.PtcName,
 					ServerPeerServiceAddr: r.SvcAddr.String(),
 					ServerPeerServiceNet: r.SvcPermNet.String(),
-					ServerPeerOption: r.SvcOption.string(),
+					ServerPeerOption: r.SvcOption.String(),
 				})
 			}
 			cts.route_mtx.Unlock()
@@ -319,7 +319,7 @@ func (ctl *server_ctl_server_conns_id_routes_id) ServeHTTP(w http.ResponseWriter
 				ClientPeerName: r.PtcName,
 				ServerPeerServiceAddr: r.SvcAddr.String(),
 				ServerPeerServiceNet: r.SvcPermNet.String(),
-				ServerPeerOption: r.SvcOption.string(),
+				ServerPeerOption: r.SvcOption.String(),
 			})
 			if err != nil { goto oops }
 
diff --git a/server.go b/server.go
index 2bf4ca0..3e7c9fe 100644
--- a/server.go
+++ b/server.go
@@ -381,7 +381,7 @@ func (cts *ServerConn) make_route_listener(id RouteId, option RouteOption, svc_r
 			svcaddr = &net.TCPAddr{IP: net.IPv6zero, Port: 0}
 		}
 	} else {
-		return nil, nil, fmt.Errorf("invalid route option value %d(%s)", option, option.string())
+		return nil, nil, fmt.Errorf("invalid route option value %d(%s)", option, option.String())
 	}
 
 	l, err = net.ListenTCP(nw, svcaddr) // make the binding address configurable. support multiple binding addresses???