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# pathmtu

Use the "pathmtu" command to display and configure the PathMTU Discovery service function.

View settings

`msh> pathmtu`

Configuration

`msh> pathmtu {on|off}`

- The default is "on".

- If the MTU size of the sent data is larger than the router's MTU, the router will declare it impassable, and communication will fail. If this happens, setting "pathmtu" to "on" optimizes the MTU size and prevents data output failure.

- Depending on the environment, information might not be obtained from the router, and communication will fail. If this happens, set "pathmtu" to "off".