XP 클라이언트 장비에서 서버급 NT 장비와의 쌍방향 통신 중에 서비스 장애가 발생하여 확인해보니..
헉!! 이럴수가 XP에서는 TCP/IP 동시 접속 포트를 10개로 제한하고 있다고 합니다.
이유인즉,,
인터넷을 통한 웜 바이러스나 Dos(Denial of Service) 형태의 네트워크 공격의 급속한 전파를 차단하기 위해서
MS에서 동시 접속 가능한 포트를 기본 10개로 했다고 하네요.
참고로,
- XP SP1 의 경우 포트별 동시 접속 무제한
- XP SP2 이상으로 넘어가면서 홈에디션은 5개, 프로페셔널은 10개 까지만 지원
[Half-open limit fix 4.2] 이라는 프로그램을 통해 접속 포트 수치를 쉽게 수정할 수 있습니다.
1. 다운로드 : http://www.half-open.com/download_en.htm
2. 실행 화면
- 현재 한계치 : 10개
- 새로운 한계치 : 기본 100으로 세팅되어 있는데 임의로 수정 가능
- 새로운 한계치 입력 후 'Tcpip.sys에 추가' 버튼 클릭
3. 메시지 확인 창 (한계치 수정 후 재부팅해야 실제 적용됨)
* XP SP2 이상의 경우에만 접속 포트 제한이 있으며, 비스타나 윈도우7 에서는 포트 제한이 없다고 하네요.
아래 화면은 윈도우7 에서 프로그램 실행시 나타나는 메시지 화면입니다.
* 프로그램 제공 사이트 소개자료
http://www.half-open.com
Half-open limit fix is a program designed to change the maximum number of concurrent half-open outbound TCP connections (connection attempts) in the Windows system tcpip.sys file.
Microsoft first introduced this limit in Windows XP SP2 and it is present in later versions, which purpose is to try to slow the spread of virus and malware from system to system, and also to reduce the impact of infected systems participating in DoS (Denial of Service) attacks.
Microsoft's limiter makes it impossible for Windows systems to have more than 10 concurrent half-open outbound connections; after 10, new connection attempts are put in a queue and forced to wait. Thus, the speed of connection to other PCs is limited.Therefore, the speed of connection to other computers is actually limited.
P2P (peer-to-peer) programs like µTorrent, BitComet, eMule, P2P TV, etc.,are generally the programs mostly affected. Since bittorrent apps tend to use up all 10 of the half-open connections, other Internet activity—especially the loading of web pages—can become extremely slow. The delay before opening a new page can take over ten seconds: this delay occurs regardless of your Internet connection speed.
Half-open limit fix remedies this problem by increasing the maximum limit of half-open connections. For most Internet users, changing the limit to 100 will be more than sufficient.
Half-open limit fix 4.2
Instruction:
1) Run Half-open limit fix
2) Choose a new limit of concurrent half-open outbound connections quantity and press "Add to tcpip.sys" (for most Internet users, changing the limit to 100 will be more than sufficient)
3) Restart computer and enjoy
Running the program again may be required if Windows updates tcpip.sys, such as when a new SP is released. If program ceases to work on an updated tcpip.sys file, a new version will be available at this site.
Vista and Windows 7 users: Perhaps in the future, after updating Windows or installing a new Service Pack, a "Test mode" watermark may appear. It may appear because in all versions of Vista and Windows 7 (except in Vista x86 without SP1) there is the imposing drivers signature check, and the tcpip.sys file sign with test signature after patching. In such case, it should only require a simple re-installation of the program to remove the watermark.
Half-open limit fix is a program designed to change the maximum number of concurrent half-open outbound TCP connections (connection attempts) in the Windows system tcpip.sys file.
Microsoft first introduced this limit in Windows XP SP2 and it is present in later versions, which purpose is to try to slow the spread of virus and malware from system to system, and also to reduce the impact of infected systems participating in DoS (Denial of Service) attacks.
Microsoft's limiter makes it impossible for Windows systems to have more than 10 concurrent half-open outbound connections; after 10, new connection attempts are put in a queue and forced to wait. Thus, the speed of connection to other PCs is limited.Therefore, the speed of connection to other computers is actually limited.
P2P (peer-to-peer) programs like µTorrent, BitComet, eMule, P2P TV, etc.,are generally the programs mostly affected. Since bittorrent apps tend to use up all 10 of the half-open connections, other Internet activity—especially the loading of web pages—can become extremely slow. The delay before opening a new page can take over ten seconds: this delay occurs regardless of your Internet connection speed.
Half-open limit fix remedies this problem by increasing the maximum limit of half-open connections. For most Internet users, changing the limit to 100 will be more than sufficient.
Half-open limit fix 4.2
Instruction:
1) Run Half-open limit fix
2) Choose a new limit of concurrent half-open outbound connections quantity and press "Add to tcpip.sys" (for most Internet users, changing the limit to 100 will be more than sufficient)
3) Restart computer and enjoy
Running the program again may be required if Windows updates tcpip.sys, such as when a new SP is released. If program ceases to work on an updated tcpip.sys file, a new version will be available at this site.
Vista and Windows 7 users: Perhaps in the future, after updating Windows or installing a new Service Pack, a "Test mode" watermark may appear. It may appear because in all versions of Vista and Windows 7 (except in Vista x86 without SP1) there is the imposing drivers signature check, and the tcpip.sys file sign with test signature after patching. In such case, it should only require a simple re-installation of the program to remove the watermark.
'::: OS ::: > NT' 카테고리의 다른 글
| IBM DSA(Dynamic System Analysis) (0) | 2011.08.02 |
|---|---|
| IIS 6.0 백업 (0) | 2011.07.08 |
| Physical Address Extension (0) | 2011.01.06 |
| Memory Limits for Windows Releases (0) | 2011.01.06 |
| Windows 버전별 최대 메모리 크기(Size) (0) | 2011.01.06 |