diff --git a/cpp/core/internal/mediums/BUILD b/cpp/core/internal/mediums/BUILD
index 8104ef44..ca9124f1 100644
--- a/cpp/core/internal/mediums/BUILD
+++ b/cpp/core/internal/mediums/BUILD
@@ -113,7 +113,10 @@ cc_test(
         "webrtc_test.cc",
     ],
     shard_count = 16,
-    tags = ["notsan"],  # NOTE(b/139734036): known data race in usrsctplib.
+    tags = [
+        "notsan",  # NOTE(b/139734036): known data race in usrsctplib.
+        "requires-net:external",
+    ],
     deps = [
         ":mediums",
         "//testing/base/public:gunit_main",
diff --git a/cpp/core/internal/mediums/webrtc/BUILD b/cpp/core/internal/mediums/webrtc/BUILD
index 52f7fc30..acfbd89a 100644
--- a/cpp/core/internal/mediums/webrtc/BUILD
+++ b/cpp/core/internal/mediums/webrtc/BUILD
@@ -61,7 +61,10 @@ cc_test(
         "signaling_frames_test.cc",
         "webrtc_socket_test.cc",
     ],
-    tags = ["notsan"],  # NOTE(b/139734036): known data race in usrsctplib.
+    tags = [
+        "notsan",  # NOTE(b/139734036): known data race in usrsctplib.
+        "requires-net:external",
+    ],
     deps = [
         ":webrtc",
         "//net/proto2/compat/public:proto2",