Merge remote-tracking branch 'origin/master'

brutella · Oct 22, 2024 · 104764c · 104764c
2 parents 1150e0d + ba39f3a
commit 104764c
Showing 1 changed file with 14 additions and 1 deletion.
diff --git a/mdns.go b/mdns.go
@@ -180,6 +180,13 @@ func newMDNSConn(ifs ...string) (*mdnsConn, error) {
 		if err := connIPv4.SetMulticastLoopback(true); err != nil {
 			log.Debug.Println("IPv4 set multicast loopback:", err)
 		}
+		// Set TTL to 255 (rfc6762)
+		if err := connIPv4.SetTTL(255); err != nil {
+			log.Debug.Println("IPv4 set TTL:", err)
+		}
+		if err := connIPv4.SetMulticastTTL(255); err != nil {
+			log.Debug.Println("IPv4 set multicast TTL:", err)
+		}
 
 		for _, iface := range MulticastInterfaces(ifs...) {
 			if err := connIPv4.JoinGroup(iface, &net.UDPAddr{IP: IPv4LinkLocalMulticast}); err != nil {
@@ -201,7 +208,13 @@ func newMDNSConn(ifs ...string) (*mdnsConn, error) {
 		if err := connIPv6.SetMulticastLoopback(true); err != nil {
 			log.Debug.Println("IPv6 set multicast loopback:", err)
 		}
-
+		// Set TTL to 255 (rfc6762)
+		if err := connIPv6.SetHopLimit(255); err != nil {
+			log.Debug.Println("IPv4 set TTL:", err)
+		}
+		if err := connIPv6.SetMulticastHopLimit(255); err != nil {
+			log.Debug.Println("IPv4 set multicast TTL:", err)
+		}
 		for _, iface := range MulticastInterfaces(ifs...) {
 			if err := connIPv6.JoinGroup(iface, &net.UDPAddr{IP: IPv6LinkLocalMulticast}); err != nil {
 				log.Debug.Printf("Failed joining IPv6 %v: %v", iface.Name, err)