X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/8255135bf80545a31493a83348a4e8da901a4768..f078f86ef3e6d0119845cdf8603b8174770cacc7:/test/scripts/4027-TFO-socks/4027

diff --git a/test/scripts/4027-TFO-socks/4027 b/test/scripts/4027-TFO-socks/4027
index 3cfb43ee4..a7412aecd 100644
--- a/test/scripts/4027-TFO-socks/4027
+++ b/test/scripts/4027-TFO-socks/4027
@@ -1,13 +1,19 @@
 # socks5 proxy on smtp transport, TCP Fast Open
 #
+# NOTE: ensure that TFO is fully enabled in the kernel.
+# For linux: sysctl net.ipv4.tcp_fastopen=3
+# 
 munge loopback
 #
 #
-# TFO both clients and server, no cookie yet
+# Wipe any stored TFO cookie, to start from known state.
+# Disable TFO blackhole-detection as we seem to be running afoul of that
 sudo perl
 system ("ip tcp_metrics delete 127.0.0.1");
+system ("[ -e /proc/sys/net/ipv4/tcp_fastopen_blackhole_timeout_sec ] && echo 0 > /proc/sys/net/ipv4/tcp_fastopen_blackhole_timeout_sec");
 ****
 #
+# TFO both clients and server, no cookie yet
 server -tfo PORT_D
 <<\x05\x01\x00
 >>\x05\x00
@@ -123,4 +129,8 @@ quit
 #
 millisleep 500
 #
+sudo perl
+system ("[ -e /proc/sys/net/ipv4/tcp_fastopen_blackhole_timeout_sec ] && echo 3600 > /proc/sys/net/ipv4/tcp_fastopen_blackhole_timeout_sec");
+****
+#
 # Ends