topic L3 ARP entries in General Topics

L3 ARP entries

MRamadanAHafiez — Fri, 05 Mar 2021 18:29:50 GMT

Hello Mr.

We need to make some mac address in Palo Alto L3 interface.

the question is that , How many manual arp entries can be added per single interface?

and because no document discussing it, I wanted to make sure if this works as an ARP inpection, so IP and MAC address must mach, or the packet will be dropped.

Kindly answer and confirm.

Thank you so much for your cooperation.

Re: L3 ARP entries

OtakarKlier — Mon, 08 Mar 2021 22:17:48 GMT

Hello,

Please check out this article.

https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000ClGrCAK

I hope this helps.

Cheers!

Re: L3 ARP entries

MRamadanAHafiez — Mon, 08 Mar 2021 23:03:49 GMT

Thank you very much, very useful link.

But what about the not listed ip addresses? Any how to drop them?

Re: L3 ARP entries

OtakarKlier — Tue, 09 Mar 2021 15:36:03 GMT

Hello,

One thing to remember is that the firewall works on layer 3-7. So it only cares about IP's and not MAC's. There are a few things you can do:

Give those devices IP's and then block them at the firewall

Give those MAC's DHCP reservations and then block them at the firewall

Block them at the switch with an ACL

Hope that helps.