topic Blocking internal device via mac address on ASA 5505 in Network Security https://community.cisco.com/t5/network-security/blocking-internal-device-via-mac-address-on-asa-5505/m-p/1073371#M913807 <P>I have a remote site which has low grade switches so i am unable to block devices at the switch level. Is there anything i can do on the ASA 5505 to block a specific mac address from using the internet connection. It's an unknown device connecting to our network and i would like to block it. </P> Mon, 11 Mar 2019 13:37:14 GMT Canfisco1 2019-03-11T13:37:14Z Blocking internal device via mac address on ASA 5505 https://community.cisco.com/t5/network-security/blocking-internal-device-via-mac-address-on-asa-5505/m-p/1073371#M913807 <P>I have a remote site which has low grade switches so i am unable to block devices at the switch level. Is there anything i can do on the ASA 5505 to block a specific mac address from using the internet connection. It's an unknown device connecting to our network and i would like to block it. </P> Mon, 11 Mar 2019 13:37:14 GMT https://community.cisco.com/t5/network-security/blocking-internal-device-via-mac-address-on-asa-5505/m-p/1073371#M913807 Canfisco1 2019-03-11T13:37:14Z Re: Blocking internal device via mac address on ASA 5505 https://community.cisco.com/t5/network-security/blocking-internal-device-via-mac-address-on-asa-5505/m-p/1073372#M913808 <HTML><HEAD></HEAD><BODY><P>You cannot use MAC address in ACLs.</P><P></P><P>You can try to create a static arp entry on ASA with an fictitious ip for that particular MAC and use ACL to block that IP.</P><P></P><P></P></BODY></HTML> Thu, 28 Aug 2008 16:46:26 GMT https://community.cisco.com/t5/network-security/blocking-internal-device-via-mac-address-on-asa-5505/m-p/1073372#M913808 Syed Iftekhar Ahmed 2008-08-28T16:46:26Z