June 2016
Beginner to intermediate
376 pages
8h 58m
Japanese
Content preview from データ分析によるネットワークセキュリティ
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9.3
パケットの検査と参照
193
Scapyは、セッションをテストするためのデータの作成にも利用できる。例えば、ログ記録システ
ムを新たに導入したら、まずログを取りながらpcapを使ってセッションを作成する。次に、Scapyを
使ってセッションを変更して実行し、その変更がログ記録にどのような影響を与えるかを確認する。
9.3
パケットの検査と参照
この節で扱うツールはすべて、パケットの検査と分析を主に行う。Wiresharkは最も便利なパケッ
ト検査ツールと言ってよいだろう。geoipを用いるとトラフィックデータの出所を簡単に割り出すこ
とができる。
9.3.1
Wireshark
Wiresharkに多くのページを割くつもりはない。Snortやnmapと同様、Wiresharkはトラフィッ
ク分析で最もよく使われているし、ドキュメントも整っているからだ。Wiresharkはグラフィカルな
プロトコルアナライザで
、パケットの検査や統計量収集機能だけでなく、データを調査して理解可能
な情報を取り出すためのツールも備えている。
Wiresharkの強みは、パケットデータを分析するための広範なdissectorライブラリにある。
dissectorは、パケットデータの分解やセッションの再構築を行う一連のルールや手続きである。こ
の例を図9-4に示す。これは、Wiresharkが HTTPセッションの内容を抽出して表示した様子を示す。
図9-4 セッションの再構築を表すWireshark画面例
194
9
章 他のツール ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.