Gratuitous ARP

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Hello,

I have the following question.

A windows machine, when starting it will broadcast 3 Gratuitous ARP packets.

These packets are broadcasted to all networks. When another station in the network receives this broadcast, will it automatically update its ARP cache?

I know that with Regular ARP this is not the case, but what about Gratuitous ARP?

I am a bit confused because i read the following in the wireskark FAQ:

link


The above, is it just in the case that we have Clusters? Because I run Wireshark and I can not see any updates in any ARP cache in my systems when a Gratuitous ARP is firsly broadcasted.

Thank you, any help will be appreciated

 

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If I recall correctly, in general Windows will not populate the arp cache with information from a gratuitous arp, but Linux will.

Spice Weasel

 

That΄s also what I think. Using wireshark I didn΄t see any update in the ARP cache with information from a gratuitous ARP.

So, the text that I quote earlier, i.e. the FAQ from wireshark, is it oriented for Linux or maybe for special NIC΄s that support this operation?

Thank you