C6300 Cannot change MTU size

[careys]

Modem: C6300

Firmware: V2.01.26

ISP: Spectrum

Problem: Happens when I go into NetGear Genie (via either IE 11 or MS Edge) > Setup > WAN Setup.  When I modify the MTU Size (in bytes) and click Apply at the top of the WAN Setup screen I get:

Failure

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Invalid DMZ IP address

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Click OK to go back to previous screen...

I click OK. It goes back to WAN Setup screen. MTU Size has not saved, but is still the same value as before. Note that I did not attempt to change the Default DMZ Server... I left the box unchecked.

FWIW - NO BOXES on the WAN Setup screen are checked.

My question is: What do I have to do to save the MTU change?

Thank you  🙂

[careys · Accepted solution]

Solved with workaround:  I checked the box for DMZ server and faked a DMZ server IP address, along with my MTU change. It saved both. Then I unchecked the box for DMZ Server and now just have the new MTU size.

Oh well...

[careys · Accepted solution]

Solved with workaround:  I checked the box for DMZ server and faked a DMZ server IP address, along with my MTU change. It saved both. Then I unchecked the box for DMZ Server and now just have the new MTU size.

Oh well...