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Standard ACLs - ACLs and Firewalls | Network Design | Repovive

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Network Design26 sections · 911 units44h total

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Standard ACLs

Source IP filtering only

Standard ACLs filter traffic based only on the source IP address. They're numbered $1$ - $99$ or $1300$ - $1999$ . Because they only check source addresses, you should place them close to the destination to avoid blocking traffic unnecessarily.

Example:

access-list 10 permit 192.168.1.0 0.0.0.255
access-list 10 deny any

This permits traffic from the $192.168.1.0/24$ subnet and denies everything else. Standard ACLs are simple but limited in what they can filter.