Date: Sat, 1 Sep 2007 04:06:35 +0200 From: J65nko <j65nko@gmail.com> To: freebsd-questions@freebsd.org Cc: "Shah, Baiju-p98993" <Baiju.Shah@gdc4s.com> Subject: Re: Question about Window Scaling Message-ID: <19861fba0708311906p79d53ec6vb0a968895d4c0d7a@mail.gmail.com> In-Reply-To: <38ff81c800003e27@gdc4s.com> References: <38ff81c800003e27@gdc4s.com>
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On 8/30/07, Shah, Baiju-p98993 <Baiju.Shah@gdc4s.com> wrote: > Greetings. > > We currently use Espion appliance running FreeBSD 4.9 as a mail interceptor for SPAM. We have one customer who has their mail gateway hard coded with Window Scaling (WS=9). Their mail gateway fails to establish SMTP hello connection with WS=9. However if they set their Window Scaling to 7, it works. > > Where can I go on the FreeBSD to see its configuration for Window Scale? How can I modify that configuration? Please email me with your recommendation to baiju.shah@gdc4s.com. Any and all help are appreciated. Thank you in advance. > [snip] A not well configured firewall also could cause problems with TCP window scaling. See the section "Create TCP states on the initial SYN packet" of Daniel Hartmeier's article at http://undeadly.org/cgi?action=article&sid=20060928081238 =Adriaan=
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