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Solved
CAX30 : MTU adjustments have no impact, and resets to 1500 when rebooted
CAX30, without the S. Firmware Version V1.4.12.2 On Spectrum cable in Western New York State. I own it. I did not lease it from Spectrum. One of the reasons for ownership is so I can reduce M...
Resolved by updating my stale router firmware.
Built-in firmware update support didn't find it. Installed manually, then factory-reset, then set DHCP pool to 100-200.
Cable firmware was already current.
Glad you got it working. Please mark your thread as solved so others will know. Be sure to save off a back up configuration to file for safe keeping. Saves time if a reset is needed.
https://kb.netgear.com/24231/How-do-I-back-up-the-router-configuration-settings-on-my-Nighthawk-router
Enjoy. 📡
For the benefit of anyone else who finds this later, the “reducing the value has no impact on my ping fragmentation tests” part was a feature of my Meraki MX67W. My home computer, connected directly to the CAX30, was not impacted.