Differences

This shows you the differences between two versions of the page.

--- iptables:basic_firewall [2016/10/20 19:00] – peter
+++ iptables:basic_firewall [2019/11/29 16:38] (current) – removed peter
@@ Line 1: / Line 1: @@
-====== IPTables - Basic Firewall ======
-===== Verify the IPTables package is installed =====
-<code bash>
-dpkg --list | grep iptables
-</code>
-Returns
-<code>
-ii  iptables                            1.6.0-2ubuntu3                      amd64        administration tools for packet filtering and NAT
-</code>
-===== Verify the Kernel Module is loaded =====
-<code bash>
-lsmod | grep ip_tables
-</code>
-Returns
-<code>
-ip_tables              24576  4 iptable_filter,iptable_mangle,iptable_nat,iptable_raw
-</code>
-===== Creating iptables rules =====
-<code bash>
-iptables -P INPUT DROP
-iptables -P OUTPUT DROP
-# Allowing Loopback Traffic.
-iptables -I INPUT -i lo -j ACCEPT
-# Allow established connections.
-iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
-# Allow SSH in.
-# iptables -I INPUT -p tcp --dport 22 -j ACCEPT
-iptables -A INPUT -p tcp --dport 22 -s 192.168.1.2 -j ACCEPT
-# iptables -A INPUT -p tcp --dport 80 -j ACCEPT
-# iptables -A INPUT -p tcp --dport 443 -j ACCEPT
-# Loading the ip_conntrack_ftp module
-# iptables -A INPUT -p tcp --dport 21 -j ACCEPT
-# iptables -A INPUT -p tcp --dport 20 -j ACCEPT
-</code>