From owner-freebsd-current@freebsd.org  Fri Feb 12 14:02:39 2016
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Subject: Re: IPV6 TCP6 Slow Connect
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From: Kristof Provost <kp@FreeBSD.org>
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Date: Fri, 12 Feb 2016 15:02:47 +0100
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To: Larry Rosenman <ler@lerctr.org>
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> On 12 Feb 2016, at 10:18, Larry Rosenman <ler@lerctr.org> wrote:
>=20
> On 2016-02-11 20:50, Larry Rosenman wrote:
>> On 2016-02-11 14:40, Larry Rosenman wrote:
>>> On 2016-02-11 14:25, Kristof Provost wrote:
>>> On 11 Feb 2016, at 21:23, Larry Rosenman <ler@lerctr.org> wrote:
>>> =46rom which system(s) perspective do you want the packet captures?
>>> (Firewall, FreeBSD, Windows)? I wouldn't expect it to make much of a =
difference in this case.
>>> Let's start with whatever is easiest.
>>> Regards,
>>> Kristof
>> I'll try and get these tonight when I am home, after a meetup.
>> (will be late US/CST).
>> --
>> Larry Rosenman                     http://www.lerctr.org/~ler
>> Phone: +1 214-642-9640                 E-Mail: ler@lerctr.org
>> US Mail: 7011 W Parmer Ln, Apt 1115, Austin, TX 78729-6961
>> at http://www.lerctr.org/~ler/FreeBSD/win10.pcap
> the 403 issue is fixed (forgot to chmod the file)
>> http://www.lerctr.org/~ler/FreeBSD/fbsd11.pcap
> URL corrected.
>=20
At first glance the only difference is that FreeBSD includes timestamps =
(and has a larger window scaling factor).
It might be worth turning that off to see if it makes a difference.

sysctl net.inet.tcp.rfc1323=3D1 should do the trick.

Regards,
Kristof=