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TCP sessions limitCan I limit (restrict) the maximum number of TCP sessions for an XP system?
Here is the problem: I share my internet with a friend. His PC has more that 30 active TCP sessions and even when I restrict his speed to 45% of the Internet speed, I can hardly reach 10%. When he is offline I reach the total 100% of internet speed. ADSL modem (512 down/ 128 up) --> router --> PC1 and PC2 I'm looking for a registry setting or policy restriction on PC2, to prevent him from opening more that 10 TCP sessions. This is not supported by the router. Thank You for any help! The usual warning about backing up the Windows Registry before doing
anything applies here. I'll add another warning about changing settings on your friend's computer, Have you asked for his permission? HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters Add a new DWORD value named TcpNumConnections. Set the value to the maximum number of TCP connections you want. It's easier to click the Decimal radio button and enter the number, it'll automatically be converted to Hex for you, e.g. if you're setting the maximum to 15 the value will change to 0x0000000f (15). TcpNumConnections Key: Tcpip\Parameters Value Type: REG_DWORD - Number Valid Range: 0 - 0xfffffe Default: 0xfffffe Description: This parameter limits the maximum number of connections that TCP can have open at the same time. More information can be found in KB314053: http://support.microsoft.com/default.aspx?kbid=314053 Thank You for the help!
Me and my friend will test the configuration tomorrow (it's gettings late), and post back our thesting experience. My frined is pretty unexperienced but I'm trying to teach him, whatever I can. I use regedit frequently, so there won't be any problems, but thanks for the advice! George Valkov Hi George ,
Thanks for your posting. It appears that Dan provided the information you needed. I'm glad to see that. Please feel free to post back the results or if you still have concerns about this issue. We are glad to provide assistance. Have a good day! Best regards, Vincent Xu Microsoft Online Partner Support ====================================================== Get Secure! - www.microsoft.com/security ====================================================== When responding to posts, please "Reply to Group" via your newsreader so that others may learn and benefit from this issue. ====================================================== This posting is provided "AS IS" with no warranties,and confers no rights. ====================================================== -------------------- >>From: "George Valkov" <a@b.com> <44F8005E.FFDA.00D***@claytoncorp.com>>>References: <uF7RCVbzGHA.4***@TK2MSFTNGP04.phx.gbl> Show quoteHide quote >>Subject: Re: TCP sessions limit >>Date: Fri, 1 Sep 2006 23:17:06 +0300 >>Lines: 12 >>X-Priority: 3 >>X-MSMail-Priority: Normal >>X-Newsreader: Microsoft Outlook Express 6.00.3790.2663 >>X-RFC2646: Format=Flowed; Original >>X-MimeOLE: Produced By Microsoft MimeOLE V6.00.3790.2757 >>Message-ID: <u$PxnOgzGHA.3***@TK2MSFTNGP05.phx.gbl> >>Newsgroups: microsoft.public.windowsxp.network_web >>NNTP-Posting-Host: 87-126-145-73.btc-net.bg 87.126.145.73 >>Path: TK2MSFTNGXA01.phx.gbl!TK2MSFTNGP01.phx.gbl!TK2MSFTNGP05.phx.gbl >>Xref: TK2MSFTNGXA01.phx.gbl microsoft.public.windowsxp.network_web:254560 >>X-Tomcat-NG: microsoft.public.windowsxp.network_web >> >>Thank You for the help! >>Me and my friend will test the configuration tomorrow (it's gettings late), >>and post back our thesting experience. My frined is pretty unexperienced but >>I'm trying to teach him, whatever I can. >> >>I use regedit frequently, so there won't be any problems, but thanks for the >>advice! >> >> >>George Valkov >> >> >> So far my friend has no problems with this new configuration:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters] TcpNumConnections = 0xF (15) as REG_DWORD On the other hand my internet connection has much better performance. I expected my friend to have connectivity problems and also to be unreachable when he reaches the maximum number of connections. So I told him in such case to simply stop the application that makes many TCP sessions and continue his work. He had no problems so far, but this is a configuration that needs more time to test, so we'll examine it and I may post more results in a few days or a week. I had no problems connecting to his PC via SMB and also... Telnet - to monitor his connections: netstat -n netstat -bn I can use this one (-: netstat -bn |msg 0 to send the results as a message to him :-) Hi George,
Thanks for your reply. I totaly understand your situation. Feel free to post back if the problem re-occur. Have a good day! Best regards, Vincent Xu Microsoft Online Partner Support ====================================================== Get Secure! - www.microsoft.com/security ====================================================== When responding to posts, please "Reply to Group" via your newsreader so that others may learn and benefit from this issue. ====================================================== This posting is provided "AS IS" with no warranties,and confers no rights. ====================================================== -------------------- >>From: "George Valkov" <a@b.com> <44F8005E.FFDA.00D***@claytoncorp.com> >>References: <uF7RCVbzGHA.4***@TK2MSFTNGP04.phx.gbl> <u$PxnOgzGHA.3***@TK2MSFTNGP05.phx.gbl> <YfOqTC8zGHA.4***@TK2MSFTNGXA01.phx.gbl> Show quoteHide quote >>Subject: Re: TCP sessions limit >>Date: Wed, 6 Sep 2006 14:41:46 +0300 >>Lines: 23 >>X-Priority: 3 >>X-MSMail-Priority: Normal >>X-Newsreader: Microsoft Outlook Express 6.00.3790.2663 >>X-RFC2646: Format=Flowed; Original >>X-MimeOLE: Produced By Microsoft MimeOLE V6.00.3790.2757 >>Message-ID: <ulzvQma0GHA.1***@TK2MSFTNGP04.phx.gbl> >>Newsgroups: microsoft.public.windowsxp.network_web >>NNTP-Posting-Host: 87-126-145-73.btc-net.bg 87.126.145.73 >>Path: TK2MSFTNGXA01.phx.gbl!TK2MSFTNGP01.phx.gbl!TK2MSFTNGP04.phx.gbl >>Xref: TK2MSFTNGXA01.phx.gbl microsoft.public.windowsxp.network_web:254841 >>X-Tomcat-NG: microsoft.public.windowsxp.network_web >> >>So far my friend has no problems with this new configuration: >>[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters] >>TcpNumConnections = 0xF (15) as REG_DWORD >> >>On the other hand my internet connection has much better performance. >> >>I expected my friend to have connectivity problems and also to be >>unreachable when he reaches the maximum number of connections. So I told him >>in such case to simply stop the application that makes many TCP sessions and >>continue his work. He had no problems so far, but this is a configuration >>that needs more time to test, so we'll examine it and I may post more >>results in a few days or a week. >> >>I had no problems connecting to his PC via SMB and also... >>Telnet - to monitor his connections: >> >>netstat -n >>netstat -bn >>I can use this one (-: >> netstat -bn |msg 0 >>to send the results as a message to him :-) >> >> >> 
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