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I have a Layer3 interface on the firewall that is connected to a zone that hosts multiple subnets spread across the remote sites. I would like the firewall to block the intra-zone traffic in this. To do this, I will need to give the Firewall IP as the Def gateway.

For e.g. Site A has 192.168.2.0/24 & site B has 192.168.4.0/24 , can I assign my firewall interface both 192.168.2.1 and 192.168.4.1 and block intrazone? if this possible, how many IPs can I assign to this Layer3 interface? I have 40 sites.

Thanks.