استفاده از معماری SAHAR جهت مقاوم کردن سطح کنترلی شبکه نرم‌افزار محور در برابر حملات منع سرویس
الموضوعات :
مهران شتابی
1
(دانشگاه علم و صنعت ایران)
احمد اکبری
2
(دانشگاه علم و صنعت ایران)
الکلمات المفتاحية: پروتکل OpenFlow حمله منع سرویسشبکه نرم‌افزار محور,
ملخص المقالة :
شبکه نرم‌افزار محور (SDN) نسل بعدی معماری شبکه است که با جداکردن سطح داده و سطح کنترلی، کنترل متمرکزی را با هدف بهبود قابلیت مدیریت و سازگاری شبکه امکان‌پذیر می‌سازد. با این حال به دلیل سیاست کنترل متمرکز، این نوع شبکه مستعد از دسترس خارج شدن سطح کنترلی در مقابل حمله منع سرویس است. در حالت واکنشی، افزایش قابل توجه رخدادهای ناشی از ورود جریان‌های جدید به شبکه فشار زیادی به سطح کنترلی اعمال می‌کند. همچنين، وجود رخدادهای مكرر مانند جمع‌آوری اطلاعات آماری از سراسر شبكه كه باعث تداخل شدید با عملکرد پایه سطح کنترلی می‌شود، مي‌تواند به شدت بر کارایی سطح كنترلی اثر بگذارد. برای مقاومت در برابر حمله و جلوگیری از فلج‌شدن شبکه، در این مقاله معماری جدیدی به نام SAHAR معرفی شده که از یک جعبه کنترلی متشکل از یک کنترل‌کننده هماهنگ‌کننده، یک کنترل‌کننده اصلی نصاب قوانین جریان و یک یا چند کنترل‌کننده فرعی نصاب قوانین جریان (بر حسب نیاز) استفاده می‌کند. اختصاص وظایف نظارتی و مدیریتی به کنترل‌کننده هماهنگ‌کننده باعث کاهش بار کنترل‌کننده‌های نصاب قوانین جریان می‌شود. علاوه بر آن، تقسیم ترافیک ورودی بین کنترل‌کننده‌های نصاب قوانین جریان توسط کنترل‌کننده هماهنگ‌کننده بار را در سطح کنترلی توزیع می‌کند. بدین ترتیب، با تخصیص بار ترافیکی ناشی از حمله منع سرویس به یک یا چند کنترل‌کننده فرعی نصاب قوانین جریان، معماری SAHAR می‌تواند از مختل‌شدن عملکرد کنترل‌کننده اصلی نصاب قوانین جریان جلوگیری کرده و در برابر حملات منع سرویس مقاومت کند. آزمایش‌های انجام‌شده نشان می‌دهند که SAHAR در مقایسه با راهکارهای موجود، کارایی بهتری در مواجهه با حمله منع سرویس از خود نشان می‌دهد.
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