Published on February 27, 2014
IPTables Getting Started Nishanth Kumar n|u Bangalore chapter member n|u / OWASP / G4H / SecurityXploded meet 22 Feb 2014
Agenda • Firewall Basics • Packet Basics • Linux Firewalls • What you can do with IPTables • What you can’t do with IP Tables • What you need to know about IP Tables • Few Examples & Demo 22 Feb 2014
Firewalls Prevents Unauthorized access TO or FROM network. Hardware / Software / both 22 Feb 2014
What Firewalls do ? Filtering traffic based on POLICY Policy determines what is acceptable traffic Access control over traffic Accept or Deny May perform other duties Logging ( Forensics , SLA ) Flagging ( Intrusion Detection ) QOS ( bandwidth management , inbound &outbound traffic priority ) 22 Feb 2014
Typical Packet looks like … 22 Feb 2014
Linux Firewalls IP Cop Shore wall UFW – Uncomplicated Firewall Open BSD & PF Most of the above firewall intern uses IPTables . 22 Feb 2014
Some basic commands service iptables status The above command is used to check the status of iptables service iptables start The above command is used to start the iptables service iptables stop The above command is used to stop the iptables iptables –F or iptables --flush The above command is used to clean-up all the default rules and existing rules. 22 Feb 2014
Ping Block - DROP iptables -A INPUT -p icmp -j DROP 22 Feb 2014
Description of rule iptables -A INPUT -p icmp -j DROP Service PROTOCOL NAME APPEND INPUT Chain JUMP PROTOCOL TARGET 22 Feb 2014
Ping Block - REJECT iptables -A INPUT -p icmp -j REJECT 22 Feb 2014
Description of rule iptables -A INPUT -p icmp -j REJECT Service PROTOCOL NAME APPEND INPUT Chain JUMP PROTOCOL TARGET 22 Feb 2014
Web Server - Client Example iptables -A INPUT -i eth0 -p tcp --dport 80 -j DROP 22 Feb 2014
Description of rule iptables -A INPUT -i eth0 -p tcp --dport 80 -j DROP Service APPEND INPUT INTERFACE INPUT Chain PROTOCOL NAME Port Number PROTOCOL JUMP INTERFACE NAME Destination Port TARGET 22 Feb 2014
Web Server - Client Example - 1 192.168.99.12 192.168.99.11 iptables -A INPUT –s 192.168.99.12 -p tcp --dport 80 -j DROP 22 Feb 2014
Description of rule iptables -A INPUT -s 192.168.99.12 -p tcp --dport 80 -j DROP Service APPEND Source PROTOCOL NAME Port Number INPUT Chain PROTOCOL JUMP IP Address of the Source Destination Port TARGET 22 Feb 2014
Continue in Part 2 Thank you 22 Feb 2014
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