Date: Fri, 4 Apr 2008 21:22:42 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "s3raphi" <seraphi.lord@gmail.com>, <freebsd-net@freebsd.org> Subject: Re: TCP options order changed in FreeBSD 7, incompatible with some routers Message-ID: <021701c89691$a3306020$3d010a0a@multiplay.co.uk> References: <f90b44e40803111756h517b373ala8afdff9395b7fac@mail.gmail.com><47D860AC.6030707@freebsd.org><f90b44e40803201909i2aab437bp58bc06755f60500f@mail.gmail.com><f383264b0803211553s6651fec4lb4b6f2a2f2e4af4a@mail.gmail.com> <16497816.post@talk.nabble.com>
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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@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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