diff --git a/tcpip/transport/udp/endpoint.go b/tcpip/transport/udp/endpoint.go
index 4c706ff..d896b2d 100644
--- a/tcpip/transport/udp/endpoint.go
+++ b/tcpip/transport/udp/endpoint.go
@@ -280,7 +280,10 @@
 		ttl = e.multicastTTL
 	}
 
-	sendUDP(route, v, e.id.LocalPort, dstPort, ttl)
+	err := sendUDP(route, v, e.id.LocalPort, dstPort, ttl)
+	if err != nil {
+		return 0, err
+	}
 	return uintptr(len(v)), nil
 }
 
diff --git a/tcpip/transport/udp/udp_test.go b/tcpip/transport/udp/udp_test.go
index 6c48327..3bc29ff 100644
--- a/tcpip/transport/udp/udp_test.go
+++ b/tcpip/transport/udp/udp_test.go
@@ -24,6 +24,7 @@
 )
 
 const (
+	testLinkAddr          = "\x00\x00\x00\x00\x00\x02"
 	stackV6Addr           = "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01"
 	testV6Addr            = "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02"
 	stackV4MappedAddr     = "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff" + stackAddr
@@ -92,6 +93,10 @@
 		},
 	})
 
+	// Add test IP -> MAC mappings to LinkResolverCache
+	s.AddLinkAddress(1, testV6Addr, testLinkAddr)
+	s.AddLinkAddress(1, testV4MappedAddr, testLinkAddr)
+
 	return &testContext{
 		t:      t,
 		s:      s,
@@ -719,7 +724,7 @@
 
 	testDualWrite(c)
 
-	var want uint64 = 1
+	var want uint64 = 2
 	if got := c.s.Stats().UDP.PacketsSent; got != want {
 		c.t.Fatalf("Write did not increment PacketsSent: got %v, want %v", got, want)
 	}