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Using CLI in either the RUT240 or RUTX11. I wanted to test the Wireguard VPN MTU settings by using ping -M do option, but it isnt available in the CLI version of ping.

Is there another way to test this between routers, as opposed to between LAN devices attached to the routers?

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Hello,

Use the full-featured ping from iputils:

opkg update; opkg install iputils-ping
/usr/bin/ping
Usage: ping [-LRUbdfnqrvVaAD] [-c count] [-i interval] [-w deadline]
            [-p pattern] [-s packetsize] [-t ttl] [-I interface]
            [-M pmtudisc-hint] [-m mark] [-S sndbuf]
            [-T tstamp-options] [-Q tos] [hop1 ...] destination

Regards,

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Thanks for that answer; should have thought of it myself really.