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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8.4
他の参照ツール
181
8.4
他の参照ツール
参照情報が得られるのは、ネットワークやルーティング情報だけではない。エクスプロイト、攻撃、
特定のIP アドレスのレピュテーションに関する、誰でもアクセスできるサイトが多数存在する。通
常、このようなサイトは小規模なボランティアによって運営され、利用者も多い。
8.4.1
DNSBL
DNSブラックホールリスト（DNSBL：DNS Blackhole List）は、主にアンチスパムテクニックと
して利用するDNSベースのIP アドレスデータベースである。最初の DNSBLはBGPを使って実装
されており、スパマのIPアドレスに関連するルートを動的に落としていた。今では、DNSBLは、メー
ルソフトウェアのレピュテーションデータベースとしての役割を果たしている。例えば、メール転送
エージェントはDNSBLを調べて送信IPがスパマであるかを判断し、それに応じて対応してい
る。
DNSBLは、DNSサーバにリバースルックアップ形式の機能を提供する。例えば、
dig
を使って
DNSBLでエコーアドレスを調べることができる。
$ dig 2.0.0.127.sbl.spamhaus.org
; <<>> DiG 9.8.3-P1 <<>> 2.0.0.127.sbl.spamhaus.org
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: ...
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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.