Added notes for iptables nftables

itables-nft.md

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+# Iptables & nftables
+
+## Tables
+Below are the names of the tables that rules are associated with. On web services you
+will typically only interact with the filter table.
+
+- filter
+- nat
+- mangle
+- raw 
+- security (SeLinux)
+
+**List all the rules**  
+`sudo iptables -L -v --line-numbers`
+
+**Show rules**  
+` sudo iptables -S`
+
+**Really show everything**  
+`sudo iptables-save`
+
+
+## Throttling, Rate Limiting
+- https://www.rackaid.com/blog/how-to-block-ssh-brute-force-attacks/
+- https://thelowedown.wordpress.com/2008/07/03/iptables-how-to-use-the-limits-module/
+- https://debian-administration.org/article/187/Using_iptables_to_rate-limit_incoming_connections
+- http://blog.programster.org/rate-limit-requests-with-iptables/
+
+## Links
+- http://shop.oreilly.com/product/9780596005696.do
+- https://www.garron.me/en/linux/iptables-manual.html
+- https://linux.die.net/man/8/iptables
+- https://www.digitalocean.com/community/tutorials/iptables-essentials-common-firewall-rules-and-commands
+- http://developer-should-know.com/post/128018906292/minimal-iptables-configuration
+- http://www.tricksofthetrades.net/2015/05/18/iptables-ipv4/
+- http://newartisans.com/2007/09/neat-tricks-with-iptables/
+- https://idolstarastronomer.com/iptables.html
+- https://www.tecmint.com/linux-iptables-firewall-rules-examples-commands/
+- https://wiki.archlinux.org/index.php/simple_stateful_firewall#Tricking_port_scanners
+- https://wiki.archlinux.org/index.php/Sysctl#TCP.2FIP_stack_hardening
+- https://danielmiessler.com/study/iptables/