[Bug 258732] [tcp] TCP_MAXSEG does not work

From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 07 Oct 2021 14:57:24 UTC

--- Comment #6 from zhh0000zhh <me@zhh0000zhh.com> ---
My Code:
 int mss;
 socklen_t mss_size;
 mss_size = sizeof(mss);
 getsockopt(fd, IPPROTO_TCP, TCP_MAXSEG, &mss, &mss_size); //mss <1460
 setsockopt(fd2, IPPROTO_TCP, TCP_MAXSEG, &mss, mss_size); //need same mss

for more ,you can search "TCP_MAXSEG site:github.com" in google.

in rfc793 page 19, Section 3.1, "This field must only be sent in the initial
connection request (i.e., in segments with the SYN control bit set)."

I think this is bug, not feature.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=144000 is not true.

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