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The command is sort of an “ARP Ping”, which can send an ARP Request and wait for the reply. It also has the ability to send a gratuitous ARP. Of course, it would do so with the MAC address of the interface used, but what we want it to do is to send the ARP out with the MAC address of the firewall. Fortunately we can do that as well. Just did a quick & dirty explanation of why devices send gratuitous ARP after a failover of some sort occurs, even if MAC to IP mappings don't change. This is a surprise. Does anybody have ideas about this? Must research!

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A Gratuitous ARP is an ARP Response that was not prompted by an ARP Request. The Gratuitous ARP is sent as a broadcast, as a way for a node to announce or update its IP to MAC mapping to the entire network. There are three typical use cases for Gratuitous ARP, and we will look at each of them after looking at the packet structure. The following command will send a Gratuitous ARP reply, four times, on the eth1 interface for IP address 1.2.3.4. # arping -c 4 -A -I eth1 1.2.3.4. Where, -A : ARP reply. -C 4: Send it four times.

If a router or switch sends an ARP request for its own IP address and no ARP replies are received, the router- or switch-assigned IP address is not being used by other nodes.

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Gratuitous Address Resolution Protocol (ARP) requests help detect duplicate IP addresses. A gratuitous ARP is a broadcast request for a router’s own IP address. If a router or switch sends an ARP request for its own IP address and no ARP replies are received, the router- or switch-assigned IP address is not being used by other nodes.
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A Gratuitous ARP could be a request or a reply. A Gratuitous ARP Request is the one where the Source and Destination IP address will be of the host itself which issues the request and is broadcast to the subnet and normally there will not be a reply.
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You could force a Gratuitous ARP in ASA with the following debug command: debug menu ipaddrutl 6 Example: #debug menu ipaddrutl 6 1.1.1.1. Gratuitous ARP sent for 1.1.1.1 ARP may also be used as a simple announcement protocol. This is useful for updating other hosts' mappings of a hardware address when the sender's IP address or MAC address changes. Such an announcement, also called a gratuitous ARP message, is usually broadcast as an ARP request containing the SPA in the target field (TPA=SPA), with THA set to zero. Rather, sending gratuitous ARP replies would do the trick. Perhaps using the clear arp or clear xlate forces the ASA to renew is proxy-ARP entries made for NAT purposes, and resend the gratuitous ARPs. Usage: arp-ping.exe [options] target -s ip : specify source ip -n X : ping X times -t : ping until stopped with CTRL-C -x : exit immediately after successful ping -i X : ping every X seconds -d : do an 'arp -d *' between pings (requires Administrator) (-d prevents cached ARP responses on Windows XP.) -c : include date and time on each line -m X : ignore failures that take less than X milliseconds -.

Birgitta Lindh Estelle University of Gothenburg

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Gratuitous Address Resolution Protocol (ARP) requests help detect duplicate IP addresses. A gratuitous ARP is a broadcast request for a router’s own IP address.