# 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:
# 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:
# 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'
#
# 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'
#
# First time runs will see a TFO request option only; subsequent
# ones should see the TFO cookie and fast-output SMTP banner
# (currently on a separate packet after the server SYN,ACK but before
# First time runs will see a TFO request option only; subsequent
# ones should see the TFO cookie and fast-output SMTP banner
# (currently on a separate packet after the server SYN,ACK but before
# 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 => lint.ex should have a "TFO" element.
# Assuming this is the first run since boot, the a@test recipient will not.
#
# 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.
#
# 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.
#