Posted 8/3/2020 17:10 (#8413216 - in reply to #8412503) Subject: A firewall?
When you say it's an older unit, it didn't occur to me that it may have a built-in firewall. By all means, turn off any firewall.
There may also be a "bridge" setting, which is essentially what you want.
You may want to (in this suggested order) -
1.) Update the firmware of the older unit, even if it's an old version.
2.) Re-set the unit to factory-fresh settings
3.) Try a different ethernet wire connecting the older unit to the newer modem/router
help on converting an old modem router into a switch/Acces point
