X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/ac0dcd3f05a8821d7ce042646472be1995a08042..a45431fa71165d56a6775099fad1c8806c593b0a:/test/scripts/1990-TCP-Fast-Open/1990

diff --git a/test/scripts/1990-TCP-Fast-Open/1990 b/test/scripts/1990-TCP-Fast-Open/1990
index cbedd3622..04b41a7af 100644
--- a/test/scripts/1990-TCP-Fast-Open/1990
+++ b/test/scripts/1990-TCP-Fast-Open/1990
@@ -7,7 +7,15 @@
 # A packet capture on the loopback interface will show the TFO
 # option on the SYN, but the fast-output SMTP banner will not
 # be seen unless you also deliberately emulate a long path:
-# 'sudo tc qdisc add dev lo root netem delay 100ms'
+# 'sudo tc qdisc add dev lo root netem delay 50ms'
+# You'll need iproute-tc installed, for the tc command.
+# You'll need kernel-modules-extra installed, or you get
+# an unhelpful error from RTNETLINK.
+# To tidy up:  'sudo tc qdisc delete dev lo root'
+#
+sudo perl
+system ("tc qdisc add dev lo root netem delay 50ms");
+****
 #
 # First time runs will see a TFO request option only; subsequent
 # ones should see the TFO cookie and fast-output SMTP banner
@@ -17,6 +25,10 @@
 # The client log => lint.ex  should have a "TFO" element.
 # Assuming this is the first run since boot, the a@test recipient will not.
 #
+sudo perl
+system ("ip tcp_metrics delete 127.0.0.1");
+****
+#
 # The server log <= line for b@test.ex  should have a "TFO" element, but
 # this will only be obtained when the above delay is inserted into the
 # loopback net path.
@@ -41,5 +53,10 @@ Testing
 ****
 sleep 3
 #
+#
+sudo perl
+system ("tc qdisc delete dev lo root");
+****
+#
 killdaemon
 no_msglog_check