topic Transparent MAC discovery ? in Network Security https://community.cisco.com/t5/network-security/transparent-mac-discovery/m-p/952997#M940964 <P>Hi,</P><P>docs say that PIX/ASA sends a ping to discover destination MAC address. I can not find a reason for doing that... anyone can help ? </P> Mon, 11 Mar 2019 12:17:38 GMT cgm 2019-03-11T12:17:38Z Transparent MAC discovery ? https://community.cisco.com/t5/network-security/transparent-mac-discovery/m-p/952997#M940964 <P>Hi,</P><P>docs say that PIX/ASA sends a ping to discover destination MAC address. I can not find a reason for doing that... anyone can help ? </P> Mon, 11 Mar 2019 12:17:38 GMT https://community.cisco.com/t5/network-security/transparent-mac-discovery/m-p/952997#M940964 cgm 2019-03-11T12:17:38Z Re: Transparent MAC discovery ? https://community.cisco.com/t5/network-security/transparent-mac-discovery/m-p/952998#M940965 <HTML><HEAD></HEAD><BODY><P>which doc?</P></BODY></HTML> Fri, 14 Mar 2008 11:23:46 GMT https://community.cisco.com/t5/network-security/transparent-mac-discovery/m-p/952998#M940965 Herbert Baerten 2008-03-14T11:23:46Z Re: Transparent MAC discovery ? https://community.cisco.com/t5/network-security/transparent-mac-discovery/m-p/952999#M940966 <HTML><HEAD></HEAD><BODY><P><A class="jive-link-custom" href="http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_configuration_example09186a008089f467.shtml" target="_blank">http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_configuration_example09186a008089f467.shtml</A></P><P></P><P>The security appliance records that a session is established. If the destination MAC address is in its table, the security appliance forwards the packet out of the outside interface. The destination MAC address is that of the upstream router, 192.168.1.2. If the destination MAC address is not in the security appliance table, the security appliance attempts to discover the MAC address when it sends an ARP request and a ping. The first packet is dropped.</P></BODY></HTML> Fri, 14 Mar 2008 12:03:53 GMT https://community.cisco.com/t5/network-security/transparent-mac-discovery/m-p/952999#M940966 cgm 2008-03-14T12:03:53Z