Good tutorial on iptables

OfWolfAndManOfWolfAndMan Member Posts: 923 ■■■□□□□□□□
So I just installed free radius on my Centos install to allow authentication for my routers and a few other network devices. I went through the tutorial (Pretty straightforward), yet I couldn't get it to work! 30 minutes later, it totally went over my head that it's a rule in the firewall (I did an iptables --flush since that's the only command I know for iptables). Boom! RADIUS worked. This happened when I tried getting the SDN controller Opendaylight to talk to my virtual network before as well. Does anyone have some good documentation to teach me iptables? I know LX-102 may teach me a bit, but I think it'd be useful to learn in more depth.
:study:Reading: Lab Books, Ansible Documentation, Python Cookbook 2018 Goals: More Ansible/Python work for Automation, IPSpace Automation Course [X], Build Jenkins Framework for Network Automation []

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