iptables and dhcp

[Abhishake Pathak]

I had a couple of questions regarding iptables, dhcp
and redhat 8.  
I'm running redhat 8.  I want to use my linux box as a
firewall/router.  I have two other computers that will
be connected to it.  Can someone please tell me how i
would be able to setup iptables to do this? Also i
wanted to know how i would do this if i had dhcp. 
Thank you very much

Abhishake

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