nanog mailing list archives
Re: TCP and WAN issue
From: Robert Boyle <robert () tellurian com>
Date: Thu, 29 Mar 2007 00:43:35 -0400
A lot of different theoretical things have been discussed, but basically, if you are running Windows XP, 2000, or 2003 over a WAN with anything more than 10-20ms of latency, make the following change to the registry and you will find a world of difference. Ideally, you would make the change to both sides, but as long as one side has this, it will auto-negotiate with the other side to adjust the
Start, Run, regedt32 Go to: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters Edit, New -> DWORD Value Then name it "Tcp1323Opts" (without the quotes) and change the value to 3That will give you far better performance by enabling automatic TCP window size scaling as per RFC 1323 over your WAN links (hence the key name), but only to other computers which support RFC1323. XP and 2003 default to allowing scalable windows if the far side intiates the negotiation, but that will never happen unless one side has this key set.
Values are: 0 (disable RFC 1323 options) - default before creating the key 1 (window scale enabled only) 2 (timestamps enabled only) 3 (both options enabled) Try this and let us know what you see. -Robert Tellurian Networks - Global Hosting Solutions Since 1995 http://www.tellurian.com | 888-TELLURIAN | 973-300-9211 "Well done is better than well said." - Benjamin Franklin
Current thread:
- Re: TCP and WAN issue, (continued)
- Re: TCP and WAN issue Simon Leinen (Mar 28)
- Re: TCP and WAN issue Philip Lavine (Mar 27)
- Re: TCP and WAN issue Roland Dobbins (Mar 27)
- RE: TCP and WAN issue michael.dillon (Mar 27)
- Re: TCP and WAN issue Roland Dobbins (Mar 27)
- Re: TCP and WAN issue Roland Dobbins (Mar 27)
- Re: TCP and WAN issue Adrian Chadd (Mar 27)
- Re: TCP and WAN issue Leo Bicknell (Mar 27)
- Re: TCP and WAN issue Eric A. Hall (Mar 27)
- Re: TCP and WAN issue Philip Lavine (Mar 27)
- Re: TCP and WAN issue Joe Maimon (Mar 27)
- Re: TCP and WAN issue Robert Boyle (Mar 28)