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Mastering ACLs: Secure Your Network Traffic in Only 60 Days!

Access Control Lists (ACLs) are vital in controlling what traffic passes through a router. Learn about different types of ACLs - Standard, Extended, and Named ACLs - and their configurations. Understand ACL rules, common ports, and syntax. Discover how to effectively manage ACLs, reuse them, and troubleshoot issues. Ensure your ACLs are optimized by placing them close to the traffic source. Start securing your network traffic effectively within 60 days!

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Mastering ACLs: Secure Your Network Traffic in Only 60 Days!

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Presentation Transcript

  1. In 60 Days – ICND2 Access Lists

  2. Traffic Cops • Decides what can pass through router • Set of YES/NO filters • Have several uses…

  3. Use ACLs • To filter traffic • Reference NAT pools • Debugging • With route maps for routing

  4. Types of ACL • Standard • Extended • Named

  5. Standard IP ACL • Numbered from 1 to 99 • Can filter on source host/network • Can’t filter ports or protocols

  6. Extended IP ACLs • Numbered from 100-199 • Filters port/destination/source etc. • More complicated to configure

  7. Named ACLs • Names instead of numbers • Can be standard or extended • Slightly different commands

  8. Need to Know... • Port numbers • Command syntax • ACL rules

  9. Common Ports

  10. Command Syntax • We will come to this!

  11. ACL Rule #1 • One ACL per interface per direction One incoming One incoming One outgoing One outgoing

  12. ACL Rule #2 • Processed top down • Incoming 172.16.1.1

  13. ACL Rule #3 • Implicit ‘deny all’ at bottom • Incoming 172.20.1.1

  14. ACL Rule #4 • Router can’t filter self generated traffic

  15. ACL Rule #5 – Can’t Edit Live • Can’t edit live standard or extended lists • Can edit named • Stop access list working (from interface) • Copy into notepad – edit - reapply

  16. ACL Rule #6 • Disable ACL on the interface R1(config)#no ip access-group 101 in

  17. ACL Rule #7 • Can reuse the same ACL

  18. ACL Rule #8 • Keep ‘em short • Most specific rules at top Should be at top

  19. ACL Rule #9 • Place as close to traffic source as possible Do not put it here

  20. End

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