My MT router is sending out like 30 arp requests a second for my 6 subnets. That’s WAY too much.
Is there a parameter I can tell it in general to send out ARP broadcasts slower than that?
No, and if you could it would break your network.
ARP is used whenever the router needs to communicate with another device on the local network and it doesn’t have the MAC address cached. If you block ARP it will just stop communicating. There’s something else wrong with your network.
If you want fewer ARPS then you could use static entries in the ARP cache. My feeling is though that this would be masking the real cause of the problem.
Regards
Andrew
I think you misunderstand my request.
Why would slowing down the ARP requests from the MT break my network? I’m not talking about REMOVING dynamic ARP, just slowing it down.
All it would do is take longer for changes in the ARP table to update.
Which means a change in the IP scheme might take longer for the MT router to recognize and process. Which is fine with me.
So again, is there a way to change the timing ARP broadcasts on a MT router?
So you want the router to cache the ARP requests longer than the default? As far as I know you can’t do this with mikrotik. You could just break up the collision domain reducing the amount of broadcasts per segment. Or like andrew suggested use static arp entries.
It is a nice feature request though. A arp should last at least 30 seconds, from what he is saying it sounds like its lasting 1 - or he has a ton of machines behind the router. 30 per second? Sheesh.
It sounds like his subnet is being scanned and the router is looking for the MACs of IPs that aren’t being used.
John
I think this might be the case.
So if something is scanning the subnet the router will try to resolve addresses continously for the duration of the scan. Is that what happens?