انواع کانکشن در میکروتیک

انواع كانكشن ها در ميكروتيك

هر ارتباط بين دو سيستم در شبكه توسط يك كانكشن يونيك بين سرور و كلاينت انجام مي پذيرد . بعبارتي كانكشن ها راهي براي تشخيص يوزر ها و برنامه هاي متفاوتي هستند كه از منابع شبكه اي شما استفاده مي كنند . براي ديدن كانكشن هاي موجود در ويندوز ميتوانيد از فرمان netstat استفاده كنيد . اين فرمان تمام ارتباطات شبكه اي كه در سيستم شما توسط برنامه هاي مختلف ايجاد شده را برايتان نمايش مي دهد . – خودتان بعنوان تمرين تست كنيد – در ميكروتيك نيز اين امكان توسط منوي connections از پنجره firewall فراهم ميشود . تمام ارتباطات كاربران شما با ذكر منبع – مقصد – نوع پروتكل و … در اين قسمت براي شما نمايش داده ميشود . تشخيص دليل وجود هر كدام از اين كانكشن ها براي شما بعنوان مدير شبكه مهم است ! و ناگفته پيداست كه كار چندان ساده اي هم نيست ! – براي جستجو : چرا كانكشن هاي tcp به طور قابل ملاحضه اي از كانكشن هاي udp بيشتر هستند ؟ من در سيستمم چندين كانكشن gre دارم مربوط به چيست ؟ – اما بيشتر هدف از اين بخش صحبت در مورد connection state هست . يا حالت هاي مختلف يك كانكشن . در فايروال ميكروتيك چهار حالت براي يك كانكشن در نظر گرفته شده است . established – invalid – new – related

New : همانطور كه از نامش پيداست ، به كانكشن هاي در حال ايجاد گفته ميشود . يعني يوزر از روتر بورد يا سرويس دهنده درخواست سرويس مي كند .
established : به كانكشني گفته ميشود كه به درخواستش پاسخ مثبت دادند – مباركه ! – و در حالت رد و بدل كردن اطلاعات هستند .
related : يا كانكشن مرتيط . بعضي از پروتكل ها ابتدا روي يك پورت درخواست خود را ارسال و در نهايت روي پورت ديگري اطلاعات را دريافت مي كنند ! معمولا اينگونه موارد مربوط به سرويس هايي است كه نيازمند تاييد هويت و .. هستند . مثلا سرويس دهنده ايميل شما ابتدا شما را روي https شناسايي مي كند و در نهايت با http اطلاعات را در اختيارتان قرار مي دهد . به كانكشن دوم يك كانكشن مرتبط اطلاق ميشود . – چند مثال از اين نوع كانكشن پيدا كنيد –
Invalid : كانكشن هاي نامعتبر . – چه حالتي باعث ميشود ميكروتيك يك كانكشن را نا معتبر تشخيص دهد ؟

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