アンチウイルス Linux ゲートウェイで、HTTP プロキシ設定での検査除外設定を IP アドレスで指定すると検査除外されない

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アンチウイルス Linux ゲートウェイで、HTTP プロキシ設定での検査除外設定を IP アドレスで指定すると検査除外されない - F-Secure Community

現象

アンチウイルス Linux ゲートウェイで、HTTP プロキシ設定での検査除外設定を IP アドレスで指定すると検査除外されない

診断

Linux ゲートウェイの上位に別のプロキシが有る場合、又はセルフプロキシとしている場合には、Linux ゲートウェイから見て接続先 IP が上位プロキシのアドレスとなります。このため、検査除外対象のホスト名に設定したサーバ IP と一致しないために、検査除外が機能しないように見えます。

Linux ゲートウェイの上位にプロキシが無い場合には、検査除外対象設定のホスト名に IP アドレスを設定しても、対象ホストに対する通信でのウィルススキャンの除外が機能します。

解決策

検査除外対象設定のホスト名は名前解決される FQDN で設定をすることで正常に動作します。

また、Linux ゲートウェイの稼動マシン上で利用環境に適合した DNS が正しく設定されていることが重要になります。

【参考ログ】
検査除外されない場合（GETとDIRECTのIPアドレスが同一でない）
1327996843.799 9153 192.51.16.1 TCP_MISS/200 227 GET http://100.100.100.100/ - DIRECT/127.0.0.1 text/html DETECT-STAT:CLEAN::::: ACTION:NONE: PROXY-STAT:http:0:5547:192.51.16.1:1:1:0:: PROTOCOL-STAT::: PROXY-ERROR::

検査除外される場合
1328058010.794 494 10.70.72.46 TCP_MISS/200 98204 GET http://203.216.243.240/ - DIRECT/203.216.243.240 text/html DETECT-STAT:CLEAN::::: ACTION:NONE: PROXY-STAT:http:3:5962:10.70.72.46:1:0:0 スマイリー舌 ASS_TO: PROTOCOL-STAT::: PROXY-ERROR::