Cisco access control lists I have worked out.

Posted: May 21, 2015. At: 2:28 PM. This was 2 years ago. Post ID: 8205

Useful CISCO Access Control Lists

These Cisco ACL`s are to block ICMP ping requests from a certain IP address. I developed these experimenting with GNS3. I had two Cisco 3750 routers in GNS3 and I added static IP addresses. 192.168.0.1 for the R1 router and 192.168.0.32 for R2. I then added the ACL lists to R1 and ran the write-memory command and this blocked ICMP ping requests from R2.

access-list 1 deny   192.168.0.32
access-list 101 deny   icmp any any

This is the output of the show access-lists command. This is displaying all of the information about my access lists on R1.

R1#show access-lists
Standard IP access list 1
    10 deny   192.168.0.32
Extended IP access list 101
    10 deny icmp any any (15 matches)

This is a useful way to block unwanted access to certain network resources or to limit unwanted network activity.

Here is my arp table.

R1#show arp
Protocol  Address          Age (min)  Hardware Addr   Type   Interface
Internet  192.168.0.1             -   c201.137c.0000  ARPA   FastEthernet0/0
Internet  192.168.0.32           43   c202.0478.0000  ARPA   FastEthernet0/0
Ouput from Cisco ping command.
Ouput from Cisco ping command.

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