# 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 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'
#
+# MacOS:
+# The kernel seems to have TFO enabled both ways as default.
+# There is a net.inet.tcp.clear_tfocache parameter
+## sysctl -w foo-val
+#
+# For network delays there is something called 'Network Link Conditioner'
+# which might do the job. But how to manipulate it?
+#
+#
sudo perl
system ("tc qdisc add dev lo root netem delay 50ms");
****
# (currently on a separate packet after the server SYN,ACK but before
# the client ACK).
#
-# The client log => lint.ex should have a "TFO" element.
-# Assuming this is the first run since boot, the a@test recipient will not.
+# The client log => line should have a "TFO" element.
+# The server log <= line for a@test.ex should not.
#
+# First clear any previously-obtained cookie:
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.
-#
#
#
# FreeBSD: it looks like you have to compile a custom kernel, with
****
sleep 3
#
+# 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.
+#
exim b@test.ex
Testing
****
git://git.exim.org / exim.git / blobdiff