From 48d72538e153acac69e0370eca1948a36887241f Mon Sep 17 00:00:00 2001
From: Vladimir Dubrovin <3proxy@3proxy.ru>
Date: Sat, 29 Aug 2026 22:48:39 +0300
Subject: [PATCH] Widen the port window a test binds in where the kernel does
 not pick it

bindwithrange() honours a range by setting IP_LOCAL_PORT_RANGE where it
exists, which leaves the kernel to pick a port inside it and skip the ones
still closing. Everywhere else it binds a port out of the range at random,
ten times, and lets the system choose when all ten are taken.

A port which carried a connection cannot be bound again until that close
completes - four minutes of it on Windows - so a window of fifty ports
shared by three services in one configuration can have too few left, and
the connection then binds outside the range and the case fails. The window
is five hundred ports there instead. The Linux one is unchanged: the
kernel picks from it and needs no room to spare.
---
 tests/cases/parent_ports.py | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/tests/cases/parent_ports.py b/tests/cases/parent_ports.py
index d721c26..cdf2d73 100644
--- a/tests/cases/parent_ports.py
+++ b/tests/cases/parent_ports.py
@@ -14,12 +14,19 @@ def _windows():
     net.ipv4.ip_local_port_range; a window outside it is ignored and an
     ordinary ephemeral port is used, so a fixed low window would be
     measuring the kernel's own choice rather than the setting.
+
+    Everywhere else the range is honoured by binding a port out of it at
+    random, ten times before giving up and letting the system choose. A port
+    which carried a connection a moment ago cannot be bound again while it
+    waits out its close - four minutes of it on Windows - so the window has
+    to be wide enough that ten tries do not all land on one. The window the
+    kernel picks from on Linux needs no such room, since it skips them.
     """
     try:
         with open("/proc/sys/net/ipv4/ip_local_port_range") as fp:
             low, high = (int(part) for part in fp.read().split()[:2])
     except (OSError, ValueError):
-        return (21400, 21449), (21500, 21549)
+        return (21400, 21899), (22000, 22499)
     base = low + 1000 if low + 1150 <= high else low
     return (base, base + 49), (base + 100, base + 149)