topic PIX Arp issue in Network Security https://community.cisco.com/t5/network-security/pix-arp-issue/m-p/73625#M653533 <P>I have setup a pair of PIX(failover). I have no problem ping across the firewall to remote subnet. But When i try to ping within the same subnet, it fails.</P><P></P><P>When I do show arp on one of the machine. The mac addresses of the machines in the local subnet is showing mac address on the PIX firewall interface.</P><P></P><P>When I do a no sysopt noproxyarp on the affected interface.</P><P>The problem goes away.</P><P></P><P>I am puzzled. Anyone has any ideas</P><P></P> Fri, 21 Feb 2020 06:09:35 GMT hossk 2020-02-21T06:09:35Z PIX Arp issue https://community.cisco.com/t5/network-security/pix-arp-issue/m-p/73625#M653533 <P>I have setup a pair of PIX(failover). I have no problem ping across the firewall to remote subnet. But When i try to ping within the same subnet, it fails.</P><P></P><P>When I do show arp on one of the machine. The mac addresses of the machines in the local subnet is showing mac address on the PIX firewall interface.</P><P></P><P>When I do a no sysopt noproxyarp on the affected interface.</P><P>The problem goes away.</P><P></P><P>I am puzzled. Anyone has any ideas</P><P></P> Fri, 21 Feb 2020 06:09:35 GMT https://community.cisco.com/t5/network-security/pix-arp-issue/m-p/73625#M653533 hossk 2020-02-21T06:09:35Z Re: PIX Arp issue https://community.cisco.com/t5/network-security/pix-arp-issue/m-p/73626#M653534 <HTML><HEAD></HEAD><BODY><P>The PIX is proxyarping for your inside addresses because you might have "alias" command configured, its a known issue, below is the bug ID, remove the alias command and you'll see the problem is gone, PIX will no longer prozyarp for inside addresses.</P><P></P><P>CSCdt01825</P><P></P><P>HTH</P><P>R/Yusuf</P></BODY></HTML> Sun, 14 Jul 2002 09:44:28 GMT https://community.cisco.com/t5/network-security/pix-arp-issue/m-p/73626#M653534 yusuff 2002-07-14T09:44:28Z