topic Re: Cisco ASA doesn't replying to arp requests for a router interface in Network Security

Cisco ASA doesn't replying to arp requests for a router interface

gautamgadeela — Sat, 08 Apr 2023 19:44:08 GMT

Hi ,

I'm trying to connect a cisco asa 9.8 version in GNS3 to a router and the ASA doesn't reply to the arp requests by the router which is directly connected to it. Any help?

Re: Cisco ASA doesn't replying to arp requests for a router interface

gautamgadeela — Sat, 08 Apr 2023 19:45:04 GMT

I can see the arp reply for the failover link but not for the directly connected routers

Re: Cisco ASA doesn't replying to arp requests for a router interface

MHM Cisco World — Sat, 08 Apr 2023 19:53:32 GMT

Are you sure the subnet is correct in both asa and router.

Re: Cisco ASA doesn't replying to arp requests for a router interface

gautamgadeela — Sun, 09 Apr 2023 17:14:44 GMT

Hi Yeah the subnet is same on both the router and ASA

Re: Cisco ASA doesn't replying to arp requests for a router interface

gautamgadeela — Sun, 09 Apr 2023 17:48:23 GMT

I can see that dropped blocks in arp are increasing is there any way to find out the reason, I did packet capture on arp entries with ethernet type set to arp but i don't see any dropped packets i can only see that router is sending an arp request but ASA doesn't respond back.

Re: Cisco ASA doesn't replying to arp requests for a router interface

MHM Cisco World — Sun, 09 Apr 2023 18:07:18 GMT

I face same issue before, I think it is bug so try the workaround I use
solution is config static route in router using ASA interface not using egress interface