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In 60 Days – ICND2

In 60 Days – ICND2. Access Lists. Traffic Cops. Decides what can pass through router Set of YES/NO filters Have several uses…. Use ACLs. To filter traffic Reference NAT pools Debugging With route maps for routing. Types of ACL. Standard Extended Named. Standard IP ACL.

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In 60 Days – ICND2

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  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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