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RHEL に ip_no_pmtu_disc を設定しても DF (don't fragment) フラグが表示されるのはなぜですか?

Solution Unverified - Updated 2016-04-28T04:21:20+00:00 -

Issue

ip_no_pmtu_disc を設定しても DF (don't fragment) フラグが表示されるのはなぜですか?
mtu が低い一部のクライアントが、デフォルトの mtu 設定を使用する Apache サーバーに接続することができません。

Environment

Red Hat Enterprise Linux (RHEL) 5 および 6

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