I have listed my Summit router info....
iPhotonix MoCA Adapter Model 6403
We did lots of research, could not find any useful information about iPhotonix MoCA adapter 6403. Maybe it is too old.
Let's do the following tries:
Option 1, change our product to 'D-band low':
Set a fixed IP to your computer, such as 192.168.254.10. You can follow the guide to configure the fixed IP.
Connect your computer to the LAN port of MoCA adapter via ethernet cable.
Visit http://192.168.254.254, username is admin, password is gocoax.
Go to the ‘MoCA Settings’ page
Deselect ‘D-Ext’ and ‘D-High’, only keep ‘D-Low’, save the configuration.
Reboot the device,
After boot up, connect MoCA adapter to your coaxial network. Wait for about 2 minutes.please check the MoCA link and traffic
Option 2，If option 1 doesn't work, please try to upgrade a special firmware.