From f0cf6e2b6c394150d250eaf698989e6692da45b2 Mon Sep 17 00:00:00 2001
From: Jan Tattermusch <jtattermusch@google.com>
Date: Thu, 27 Jul 2017 13:32:56 +0200
Subject: [PATCH] fix fetching of GCE default credentials on kokoro windows

---
 .../internal_ci/helper_scripts/prepare_build_windows.bat  | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/internal_ci/helper_scripts/prepare_build_windows.bat b/tools/internal_ci/helper_scripts/prepare_build_windows.bat
index 643eb380e8..95fd6a3e8e 100644
--- a/tools/internal_ci/helper_scripts/prepare_build_windows.bat
+++ b/tools/internal_ci/helper_scripts/prepare_build_windows.bat
@@ -18,6 +18,14 @@ set PATH=C:\tools\msys64\usr\bin;C:\Python27;%PATH%
 
 bash tools/internal_ci/helper_scripts/gen_report_index.sh
 
+@rem Add GCE DNS server and disable IPv6 to:
+@rem 1. allow resolving metadata.google.internal hostname
+@rem 2. make fetching default GCE credential by oauth2client work
+netsh interface ipv4 add dnsservers "Local Area Connection 8" 10.240.0.1 index=1
+netsh interface teredo set state disabled
+netsh interface 6to4 set state disabled
+netsh interface isatap set state disabled
+
 @rem Needed for big_query_utils
 python -m pip install google-api-python-client
 
-- 
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