TCP options order changed in FreeBSD 7, incompatible with some routers

[Steven Hartland]

I believe this has already been covered in quite some depth
and iirc its regards the ordering of the new tcp flags
introduced in 7. Best to have a look in the list archives for
the specifics.

    Regards
    Steve

----- Original Message ----- 
From: "s3raphi" <seraphi.lord at gmail.com>
> 
> I upgraded many web servers to FreeBSD 7.0-Release several weeks ago. These
> servers serve hundreds of thousands of users. Since then, we have had many
> users complain that they cannot connect to these servers any more. This was
> a very tricky problem to diagnose, but using packet captures on both the
> servers and the clients who have the problem I ended up with the same
> results as the original poster. The user can ping the server with ICMP. The
> user cannot complete a TCP connection.
> Client sends SYN to server
> Server responds SYN/ACK
> Client packet capture does not show the SYN/ACK arrive.
> Connection fails.
....

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