My router cant get internet from old modem

[moritezza]

hello
i have an old modem, it has internet, when i connect that modem to my router, my router cant get internet, but all other modems is fine, just this one
where can be issue?

screenshot of old modem details:

[frollic]

@moritezza

where can be issue?

by default the subnet would overlap.

change the openwrt LAN subnet, but you'll be double NATing.

[moritezza]

i think i changed already, its like below:

[frollic]

@moritezza

i think i changed already

you did indeed, how are the two devices inter connected ?