ARP timeout

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ARP timeout

L3 Networker


We have a customer who is facing issue described by this KB article :

I wonder whether it is possible to change the default timeout value which is set to 1800 seconds ?

It could be very helpfull in some situations, and most of the network devices allow to change this value.

I searched the Admin guide and CLI guide as well as the KB but I didn't find anything concerning this point.




L6 Presenter

According to these threads it seems that the value if 1800 seconds is hardcoded and cannot be changed.

Hopefully you can issue this as a feature request (given that this "hardcoded" isnt burned into the NPU's being used):

Thanks for your answer.

I read that PanOS 5.0.1 has implemented an increased ARP table. This could helps in some situations.


Another workaround could be to put a L3 device (L3 switch or such) in front of your PA and setup a linknet between this L3 device and the PA box.

Like so:

PA <-, -> L3-device <-

This way the PA box only see one mac, the mac of (or whatever ip you setup). While the L3-device takes the hit regarding shitloads of clients vs. mac-addresses.

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