I'm trying to test this new feature, but I have trouble getting the
client to actually send a cached cookie. It keeps requesting new ones
and as a consequence it never sends data in the initial SYN packet.
Tcpdump shows that the server correctly replies to a cookie request with
a cookie.
Or am I misunderstanding how it should work and is the cookie cache
per-process instead of system wide?
I'm using the test programs from
https://people.freebsd.org/~pkelsey/tfo-tools/ for this purpose.
Server and client run on r335760 or later, with no changes to
net.inet.tcp.fastopen except that server_enable was set to 1.
Related issue is that TCP_FASTOPEN is currently undocumented in tcp(4).
- Pieter
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