How to redirect traffic to specific ip?

I am creating captive portal in openwrt. When any client gets connected to openwrt router , I want that client see my login page on specific ip. How to achieve this using iptables. What rule I have to use. Please guide me.

Are you building the whole captive portal from scratch?
There are some captive portals that take care of this.

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I just want to know the iptables rule for directing traffic to a particular specific ip.

https://www.frozentux.net/iptables-tutorial/iptables-tutorial.html#DNATTARGET

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