Firewall: Redirect traffic to specific interface


I am not expert of firewall/iptables command, I need some help to setup my OpenWRT firewall.

I have 2 outbound interfaces, one is wired WAN (eth5) and a 4G link (eth4).

I want to redirect the traffic that goes to a domain(ie., to 4G interface(eth4). Maybe I am not right on that the firewall rely on the ip address, in case we can't use domain directly. Let's say we have the ip address of, how can I set the firewall to redirect the traffic to go through eth4?

BTW, can you recommend an firewall/iptables tutorial site for me?

Appreciated your help.

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