RE: Question about Window Scaling
Thank you Bob for your help. The net.inet.tcp.rfc1323 was already enabled but the problem still exists. Upgrading is not an option as it is an underlying os for an appliance running Spam Filter software. -Original Message- From: Bob Middaugh [mailto:[EMAIL PROTECTED] Sent: Thursday, August 30, 2007 11:16 AM To: Shah, Baiju-p98993; freebsd-questions@freebsd.org Subject: Re: Question about Window Scaling Hi Baiju, Try this to get started: http://proj.sunet.se/E2E/tcptune.html http://www.wormulon.net/files/pub/FreeBSD_Network_Tuning_-_slides.pdf If upgrading is an option: http://caia.swin.edu.au/reports/070717B/CAIA-TR-070717B.pdf Hope that helps, Bob -- Original message -- From: Shah, Baiju-p98993 [EMAIL PROTECTED] 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 [EMAIL PROTECTED] Any and all help are appreciated. Thank you in advance. Baiju Shah Network Security Engineer General Dynamics-C4S West 8201 E. McDowell Road MD: H1217 Scottsdale, Arizona 85257 Desk: 480.441.9877 Email: [EMAIL PROTECTED] Important Confidentiality Notice: This message and any attachments are confidential and may be protected by legal privilege. If you are not the intended recipient, be aware that any disclosure, copying, distribution, or use of this message or any attachment is prohibited. If you have received this message in error, please notify me immediately by returning it to me and deleting this copy from your system. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Question about Window Scaling
On 8/30/07, Shah, Baiju-p98993 [EMAIL PROTECTED] 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 [EMAIL PROTECTED] 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=articlesid=20060928081238 =Adriaan= ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Question about Window Scaling
Hi Baiju, Try this to get started: http://proj.sunet.se/E2E/tcptune.html http://www.wormulon.net/files/pub/FreeBSD_Network_Tuning_-_slides.pdf If upgrading is an option: http://caia.swin.edu.au/reports/070717B/CAIA-TR-070717B.pdf Hope that helps, Bob -- Original message -- From: Shah, Baiju-p98993 [EMAIL PROTECTED] 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 [EMAIL PROTECTED] Any and all help are appreciated. Thank you in advance. Baiju Shah Network Security Engineer General Dynamics-C4S West 8201 E. McDowell Road MD: H1217 Scottsdale, Arizona 85257 Desk: 480.441.9877 Email: [EMAIL PROTECTED] Important Confidentiality Notice: This message and any attachments are confidential and may be protected by legal privilege. If you are not the intended recipient, be aware that any disclosure, copying, distribution, or use of this message or any attachment is prohibited. If you have received this message in error, please notify me immediately by returning it to me and deleting this copy from your system. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
