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ヤマハルーターでパケットが分割されたかどうかの調査

Last updated at Posted at 2025-12-06

小ネタです。(私的に)滅多に使わないけど、知っていると何かの時に使うかもしれないコマンド。

syslog debug on
packetdump INTERFACE infinity

こういうログが出てくるので、MTUの調整とかで役に立ちます。
2011/01/07 14:27:59: PP[01] OUT:IP ICMP xxx.xxx.xxx.xxx > yyy.yyy.yyy.yyy [fragmented]

infinity で設定しているとログが溢れて大変なことになるので、元に戻すのを忘れないようにしましょう。

no packetdump INTERFACE infinity
no syslog debug on
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