topic reverse lookup in MAC table in Network Security https://community.cisco.com/t5/network-security/reverse-lookup-in-mac-table/m-p/1414549#M720467 <P><!--[if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman","serif";} </style> <![endif]--><SPAN style="font-size: 11pt; font-family: &amp;quot;Calibri&amp;quot;,&amp;quot;sans-serif&amp;quot;; color: #1f497d;">Can cisco NOT perform reverse lookup in MAC table when installed in layer 3??? I heard it only works in (Transparent mode) function, which means no NAT/PAT and VPNs. Is that true or not? Can you please guide me to a link?<BR /></SPAN></P> Mon, 11 Mar 2019 17:22:16 GMT mohsin.khan 2019-03-11T17:22:16Z reverse lookup in MAC table https://community.cisco.com/t5/network-security/reverse-lookup-in-mac-table/m-p/1414549#M720467 <P><!--[if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman","serif";} </style> <![endif]--><SPAN style="font-size: 11pt; font-family: &amp;quot;Calibri&amp;quot;,&amp;quot;sans-serif&amp;quot;; color: #1f497d;">Can cisco NOT perform reverse lookup in MAC table when installed in layer 3??? I heard it only works in (Transparent mode) function, which means no NAT/PAT and VPNs. Is that true or not? Can you please guide me to a link?<BR /></SPAN></P> Mon, 11 Mar 2019 17:22:16 GMT https://community.cisco.com/t5/network-security/reverse-lookup-in-mac-table/m-p/1414549#M720467 mohsin.khan 2019-03-11T17:22:16Z Re: reverse lookup in MAC table https://community.cisco.com/t5/network-security/reverse-lookup-in-mac-table/m-p/1414550#M720468 <HTML><HEAD></HEAD><BODY><P>Correct, no reverse lookup in MAC table in routed (layer 3) mode.</P><P></P><P>Transparent firewall does support NAT now, but still no VPN termination support for transparent firewall.</P><P></P><P>NAT support in transparent firewall:</P><P><A class="jive-link-external-small" href="http://www.cisco.com/en/US/docs/security/asa/asa82/configuration/guide/nat_overview.html#wp1078175">http://www.cisco.com/en/US/docs/security/asa/asa82/configuration/guide/nat_overview.html#wp1078175</A></P></BODY></HTML> Wed, 17 Mar 2010 13:18:28 GMT https://community.cisco.com/t5/network-security/reverse-lookup-in-mac-table/m-p/1414550#M720468 Jennifer Halim 2010-03-17T13:18:28Z