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IOS Access Control Lists

 
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Manage episode 151067176 series 1014225
Content provided by Darrell Root. All podcast content including episodes, graphics, and podcast descriptions are uploaded and provided directly by Darrell Root or their podcast platform partner. If you believe someone is using your copyrighted work without your permission, you can follow the process outlined here https://staging.podcastplayer.com/legal.
In this video demonstration, we show an example of writing IOS Access Control Lists (ACL's) on a home router. We use the revision control system (RCS) to maintain the master ACL file and push the ACL's to the router via TFTP. This is similar to many production networks, where maintaing comments and old revisions of ACL's is a requirement. We also show examples explaining the "don't care bit" format of IOS ACLs. Many network engineers mistakenly refer to the format as inverse-netmask, but that is incorrect.
PIXes, FWSMs, and ASA's use a netmask format for ACLs. It is vitally important not to make the mistake of accidentally pushing a netmask format ACL line to an IOS device. That sort of error could result in an unplanned hole in your firewall and a serious security incident.
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41 episodes

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IOS Access Control Lists

Cisco Hands On Training Podcast

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Manage episode 151067176 series 1014225
Content provided by Darrell Root. All podcast content including episodes, graphics, and podcast descriptions are uploaded and provided directly by Darrell Root or their podcast platform partner. If you believe someone is using your copyrighted work without your permission, you can follow the process outlined here https://staging.podcastplayer.com/legal.
In this video demonstration, we show an example of writing IOS Access Control Lists (ACL's) on a home router. We use the revision control system (RCS) to maintain the master ACL file and push the ACL's to the router via TFTP. This is similar to many production networks, where maintaing comments and old revisions of ACL's is a requirement. We also show examples explaining the "don't care bit" format of IOS ACLs. Many network engineers mistakenly refer to the format as inverse-netmask, but that is incorrect.
PIXes, FWSMs, and ASA's use a netmask format for ACLs. It is vitally important not to make the mistake of accidentally pushing a netmask format ACL line to an IOS device. That sort of error could result in an unplanned hole in your firewall and a serious security incident.
  continue reading

41 episodes

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