Implementing Firewall Technologies

Implementing Firewall Technologies

1. ACLs initially

   • Standard
   • Extended
   • Named
   • Numbered

2. Firewalls Today

   • packet filtering
   • stateful
   • application gateway
   • proxy
   • address translation
   • hybrid
   • host-based
   • transparent

3. Mitigation Attack

   • Antispoofing
   • Necessary Traffic
     • SSH
     • Syslog
     • SNMP
   • ICMP Abuse
     • echo reply
     • source quench
     • Unreachable
   • SNMP Exploits

4. Benefits of Firewall

   • prevent the exposure
   • sanitize protocol flow
   • block malicious data
   • reduce security management

5. Limitations

   • become a point of failure
   • Data Cannot be passed
   • Slow Performance
   • Unauthorized traffic can be tunneled

6. Classic firewall

7. Firewalls in network design

   • private and public
   • DMZ
   • ZPFs

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