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<br /> <b>Warning</b>: Attempt to read property "cat_ID" on false in <b>/home/yusuke3183/taikutsu-mccartney.com/public_html/vpn.taikutsu-mccartney.com/wp-content/themes/quadra_biz001/admin/inc/front_page.php</b> on line <b>137</b><br /> <br /> <b>Warning</b>: Attempt to read property "cat_ID" on false in <b>/home/yusuke3183/taikutsu-mccartney.com/public_html/vpn.taikutsu-mccartney.com/wp-content/themes/quadra_biz001/admin/inc/front_page.php</b> on line <b>137</b><br /> <br /> <b>Warning</b>: Attempt to read property "cat_ID" on false in <b>/home/yusuke3183/taikutsu-mccartney.com/public_html/vpn.taikutsu-mccartney.com/wp-content/themes/quadra_biz001/admin/inc/front_page.php</b> on line <b>137</b><br /> ICMPとは /home/yusuke3183/taikutsu-mccartney.com/public_html/vpn.taikutsu-mccartney.com/wp-content/themes/quadra_biz001/admin/inc/front_page.php on line 137

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ICMP(Internet Control Message Protocol)ICMPとは、TCP/IPのパケット転送において、発生した各種エラー情報を報告するために利用されるネットワークプロトコルです。">
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class="wp-singular post-template-default single single-post postid-533 single-format-standard wp-theme-quadra_biz001 use_header_fix use_mobile_header_fix aa-prefix-taiku-">

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用語解説


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第92回:ICMP(アイシーエムピー)


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ICMP(Internet Control Message Protocol)

ICMPとは、TCP/IPのパケット転送において、発生した各種エラー情報を報告するために利用されるネットワークプロトコルです。通信中にエラーが発生した場合は、エラーの発生場所からパケットの送信元に対して、ICMPによってエラー情報が逆送されます。途中経路の機器は、この報告によってネットワークに発生した障害を知ることができるのです。

このICMPを利用したネットワーク検査コマンドとして有名なのが、pingとtracerouteです。

pingはネットワークの疎通を確認するためのコマンドです。具体的には、確認したいコンピュータに対してIPパケットを発行し、そのパケットが正しく届いて返答が行われることを確認します。このコマンドが正常に実行されることで、パケットが無事に届けられることがわかり、ネットワークの疎通を確認することができるわけです。また、この際には到達時間も表示されるため、簡単なネットワーク性能チェックにも利用できます。

tracerouteはネットワークの経路を調査するためのコマンドです。目的のコンピュータに到達するまでの間に、どのようなルータを経由して辿り着くのかといった情報をリスト表示することができます。たとえばpingが正常に終了しなかった場合、このコマンドによって経路上で不良を起こしている箇所を見つけ出すことができます。また、経路上に存在する各ルータからのレスポンスを計ることができますので、ネットワーク上のボトルネック(経路上で通信速度の出ない要因となっている個所)を調査することも可能です。

関連用語

>>戻る【第91回:MIME(マイム)】

>>続く【第93回:HTML(エイチティーエムエル)】


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第92回:ICMP(アイシーエムピー)


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TOP

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