topic Re: ARP request collision in Network Security https://community.cisco.com/t5/network-security/arp-request-collision/m-p/1386430#M735455 <HTML><HEAD></HEAD><BODY><P>This is due to duplicate IP address in your network.&nbsp; Two mac addresses are claiming to own one IP address.</P><P></P><P>Pls. track both the MAC addresses in question and verify the IP address configuration.</P><P></P><P><SPAN>Also read this defect </SPAN><A class="jive-link-external-small" href="http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&amp;bugId=CSCsj05830">http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&amp;bugId=CSCsj05830</A></P><P></P><P>-KS</P></BODY></HTML> Fri, 12 Mar 2010 04:37:52 GMT Kureli Sankar 2010-03-12T04:37:52Z ARP request collision https://community.cisco.com/t5/network-security/arp-request-collision/m-p/1386429#M735427 <P>I am running an ASA 5510 box. Recently I started to receive alot of SNMP alerts,</P><P></P><P>----------------------------</P><P>Possible attack - Received ARP collision - 172.16.110.244 - 20 - Local use 4 - 4 - Warning</P><P>Received ARP request collision from 172.16.110.102/0014.5efd.6c3a on interface Inside</P><P>----------------------------</P><P></P><P>.244 is the firewall internal interface</P><P>.102 is my DHCP server, running NIC teaming.</P><P></P><P>I had not made changes to firewall at all and suddenly I got these.</P><P></P><P>I had issue a "clear arp" on ASA5510 but problem still persist.</P><P></P><P>Any solution?</P> Mon, 11 Mar 2019 17:20:06 GMT https://community.cisco.com/t5/network-security/arp-request-collision/m-p/1386429#M735427 jasontan 2019-03-11T17:20:06Z Re: ARP request collision https://community.cisco.com/t5/network-security/arp-request-collision/m-p/1386430#M735455 <HTML><HEAD></HEAD><BODY><P>This is due to duplicate IP address in your network.&nbsp; Two mac addresses are claiming to own one IP address.</P><P></P><P>Pls. track both the MAC addresses in question and verify the IP address configuration.</P><P></P><P><SPAN>Also read this defect </SPAN><A class="jive-link-external-small" href="http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&amp;bugId=CSCsj05830">http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&amp;bugId=CSCsj05830</A></P><P></P><P>-KS</P></BODY></HTML> Fri, 12 Mar 2010 04:37:52 GMT https://community.cisco.com/t5/network-security/arp-request-collision/m-p/1386430#M735455 Kureli Sankar 2010-03-12T04:37:52Z