diff --git a/android/src/main/java/com/tailscale/ipn/NetworkChangeCallback.kt b/android/src/main/java/com/tailscale/ipn/NetworkChangeCallback.kt
index 2919e4d431..90a6cb1eaa 100644
--- a/android/src/main/java/com/tailscale/ipn/NetworkChangeCallback.kt
+++ b/android/src/main/java/com/tailscale/ipn/NetworkChangeCallback.kt
@@ -197,6 +197,14 @@ object NetworkChangeCallback {
 
     if (dns.updateDNSFromNetwork(sb.toString())) {
       TSLog.d(TAG, "$why: updated DNS config for iface=${info.linkProps.interfaceName}")
+
+      val gatewayIP = info.linkProps.routes                                                                                                                                          
+      .filter { it.isDefaultRoute && it.gateway != null }
+      .sortedBy { if (it.gateway is java.net.Inet4Address) 0 else 1 }                                                                                                            
+      .firstNotNullOfOrNull { it.gateway?.hostAddress }                                                                                                                          
+      ?: ""
+                                                                                                                                                                                 
+      Libtailscale.onGatewayChanged(gatewayIP)              
       Libtailscale.onDNSConfigChanged(info.linkProps.interfaceName)
     }
   }
diff --git a/libtailscale/callbacks.go b/libtailscale/callbacks.go
index 9daec5c6b5..65489cccbc 100644
--- a/libtailscale/callbacks.go
+++ b/libtailscale/callbacks.go
@@ -5,6 +5,8 @@ package libtailscale
 
 import (
 	"sync"
+
+	"tailscale.com/net/netmon"
 )
 
 var (
@@ -36,6 +38,11 @@ func OnDNSConfigChanged(ifname string) {
 	}
 }
 
+// OnGatewayChanged is called when LinkProperties provides an updated default gateway IP.
+func OnGatewayChanged(gatewayIP string) {
+	netmon.UpdateLastKnownDefaultGateway(gatewayIP)
+}
+
 var android struct {
 	// mu protects all fields of this structure. However, once a
 	// non-nil jvm is returned from javaVM, all the other fields may