No public prefix on lan

daemon.warn odhcpd[2069]: A default route is present but there is no public prefix on lan thus we don't announce a default route!

Is this syslog message informational or something that I need to address?

iPhone -> ipheth/usb -> openwrt 22.03.02/Linksys WRT3200ACM

Thank you!

Do you to have IPv6 connectivity? If yes, then you need to fix that issue.
Does your provider gives you proper IPv6 connectivity? Do you know if they use Prefix Delegation? And if yes, what subnet size?

In my case Deutsche Telekom gives me /56 and the wan6 config is as simple as:

config interface            'wan6'
    option  device          'eth0.7'  # You may need to adjust the device
    option  proto           'dhcpv6'
    option  reqaddress      'try'
    option  reqprefix       '56'

Run ifstatus wan6. If your ISP only offers /64 service you'll need to use relaying to offer IPv6 connectivity to the LAN.