Difference between revisions of "OPS535 Linux Firewall Review"
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= iptables = | = iptables = | ||
* raw table | * raw table | ||
Revision as of 01:20, 17 January 2021
- Text book: Chapter 13
Contents
Concepts
- Netfilter/iptables with iptables(legacy)
- Netfilter/nftables with iptables(nt_tables)
- firewall with firewalld (front end for netfilter/iptables and netfilter/nftables)
Command line tools
- iptables
- ip6tables
- arptables
- ebtables
- nft
- firewall-cmd
iptables
- raw table
- PREROUTING chain
- OUTPUT chain
- managle table
- PREROUTING
- INPUT
- FORWARD
- OUTPUT
- POSTROUTING
- nat table
- PREROUTING
- INPUT
- OUTPUT
- POSTROUTING
- filter table
- INPUT
- FORWARD
- OUTPUT
- security table
- INPUT
- FORWARD
- OUTPUT
rules
iptables -t filter -A INPUT -p tcp --dport 22 -j ACCEPT
|---------------| |---------------| |--------|
where and when match spec. action
