Ravi Sir's Cards › AWS
Four Linux FW tools
This revision card explains Four Linux FW tools. It starts from the need that mixing frontends rewrites each other's rules. It describes iptables, nftables, firewalld, ufw — pick one stack; nft is modern backend. The how-to section notes list , then change , then test curl/nc , then save permanent. An example on the card is sana Iqbal standardises Ubuntu labs on ufw and RHEL on firewalld.
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What this card says
Why do we need it?
Mixing frontends rewrites each other's rules.
What is it?
iptables, nftables, firewalld, ufw — pick one stack; nft is modern backend.
nftables
How to do it
List → change → test curl/nc → save permanent.
Example
Sana Iqbal standardises Ubuntu labs on ufw and RHEL on firewalld.