diff --git a/tests/stream_netns/network.py b/tests/stream_netns/network.py
index 85927516..0ccaf126 100644
--- a/tests/stream_netns/network.py
+++ b/tests/stream_netns/network.py
@@ -3,6 +3,7 @@
 import json
 import os
 from pathlib import Path
+import select
 import subprocess
 import time
 
@@ -89,7 +90,7 @@ class Network:
         child = subprocess.Popen(["unshare", "--net", "--", "python3", "-u", "-c", keeper],
                                  stdin=subprocess.PIPE, stdout=subprocess.PIPE, text=True)
         self.children.append(child)
-        if child.stdout.readline().strip() != str(child.pid):
+        if not select.select([child.stdout], [], [], 5)[0] or child.stdout.readline().strip() != str(child.pid):
             raise RuntimeError(f"Cannot create namespace {name}")
         inode = os.readlink(f"/proc/{child.pid}/ns/net")
         if inode in {self.controller, self.host_namespace}:
diff --git a/tests/stream_netns/probe.py b/tests/stream_netns/probe.py
index dff95a8e..4e0ecaa8 100644
--- a/tests/stream_netns/probe.py
+++ b/tests/stream_netns/probe.py
@@ -54,8 +54,6 @@ def serve(address):
                     samples.append((time.monotonic() - started) * 1000)
                     observed = reply["observed"]
                     break
-            else:
-                pass
             if len(samples) + lost < _ + 1:
                 lost += 1
         print(json.dumps({"samples_ms": samples, "observed": observed, "lost": lost}), flush=True)
@@ -90,8 +88,14 @@ class Probes:
         return json.loads(line)
 
     def calibrate(self):
-        results = {"wan": [], "nat": []}
+        results = {"lan": [], "wan": [], "nat": []}
         public = {n.country: n for n in NODES if not n.nat and n.client_type == 0}
+        for country, first in public.items():
+            second = next(n for n in NODES if n.country == country and not n.nat and n.name != first.name)
+            result = self.exchange(first.name, second.ip, count=20)
+            if len(result["samples_ms"]) < 19 or statistics.median(result["samples_ms"]) > 10:
+                raise RuntimeError(f"LAN {country}: measured connection is not a good local link: {result}")
+            results["lan"].append(dict(result, country=country, median_ms=statistics.median(result["samples_ms"])))
         for link in WANS:
             result = self.exchange(public[link.a].name, public[link.b].ip, count=40)
             if len(result["samples_ms"]) < 30: