nDPI Derin Paket İnceleme Aracı Üzerinde Bir Çalışma

Öz

Derin paket inceleme (DPI), ağ paketlerini beş katmanlı ağ modelinde bulunan uygulama katmanına kadar analiz ederek ağda bulunan uygulama protokollerini tespit etmek için kullanılan ileri seviye bir paket tanımlama yöntemidir. Bu çalışmada DPI yöntemi kullanarak paket tanımlaması yapan açık kaynak kodlu nDPI kütüphanesi ele alınmıştır. Bu kütüphane üzerinden yeni uygulama protokolü tespiti ve eksikliği bulunan bazı protokollere de eklemeler sağlanarak alana katkıda bulunulması hedeflenmiştir. Ayrıca, nDPI tarafından yanlış kategorize edildiği tespit edilen ağ paketleri için yeni kural tanımlarının yapılarak bu gibi durumların düzeltilmesi sağlanmıştır. Tüm bunlar için, ağ trafiği Wireshark paket yakalama aracıyla kaydedilip paket içerikleri analiz edilerek yeni kurallar oluşturulmuş ve yeni bulunan uygulama protokolleri nDPI kütüphanesine eklenmiştir. Son olarak, nDPI’da uygulama protokolü tespiti için yapılan çalışmaların kısmi bir otomasyonu yazılmıştır.

Anahtar Kelimeler

• Derin paket inceleme
• DPI
• nDPI
• Deep packet inspection

A Study on the nDPI Deep Packet Inspection Tool

Öz

Deep packet inspection (DPI) is a an advanced packet identification method used to detect application protocols found in the network by analyzing network packets up to the application layer in the five-layer network model. In this study, the open source nDPI library, which uses DPI method to identify packets, is discussed. It is aimed to contribute to the field by detecting new application protocols and adding some missing protocols through this library. In addition, new rule definitions were made for network packets that were found to be miscategorized by nDPI, and such cases were corrected. For all these, network traffic was recorded with Wireshark packet capture tool, packet contents were analyzed, new rules were created and newly found application protocols were added to the nDPI library. Finally, a partial automation of the work done for the application protocol detection in nDPI was written.

Anahtar Kelimeler

• Deep packet inspection
• DPI
• nDPI

Kaynakça

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