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お手軽netflow

Last updated at Posted at 2016-05-25

#インストール
$ sudo apt-get install nfdump -y
最新はこっち https://github.com/phaag/nfdump

#使い方
##Capture Start
$ nfcapd -w -t 3600 -D -l ~/netflow -p 5000

w:ファイルに書き出す
t:ファイルに書き出す間隔 ※毎時0分からの間隔
D:デーモンモードで起動
l:書き出すディレクトリ
p:受信ポート ※環境に合わせて変更

##Dump
###リスト表示
$ nfdump -r nfcapd.current

###raw表示
$ nfdump -o raw -r nfcapd.current

###リスト表示をSourceIPでソート
$ nfdump -r nfcapd.current -n 20 -s srcip/bytes

###IP Rangeでフィルタ
$ nfdump -r nfcapd.current 'net 192.168.0.0/16'

###特定ASとの通信をリスト
$ nfdump -r nfcapd.current 'as hoge' -n 20 -s srcip

##Capture Stop
$ ps aux | grep nfcapd
$ kill pid

##rotate
crontab -e
0 0 * * * find /home/hoge/netflow/ -name "nfcapd.*" -mtime +3 -delete

#参考資料
http://enog.jp/wp-content/uploads/2010/08/enog4-takasima-0827.pdf
http://knqyf263.hatenablog.com/entry/2014/02/27/005353

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