ARP Table reporting routes for entire /22 subnet



  • So I'm using IP passthrough on my AT&T gateway device (an ARRIS NVG589) so that my pfSense firewall/router's WAN interface is getting the public dynamic IPv4 address. I'm also using the Cascaded Router feature for an /8 block of static IPv4 addresses.

    While I was troubleshooting something else, I found that the pfSense ARP Table has a huge amount of entries corresponding to each IP address on the /22 subnet of my dynamic IPv4 address. The MAC address for the routes is the address of the gateway device.

    Since I would rather the WAN interface have this IP address, is there any way to prevent the ARP Table from enumerating all these entries?

    Thanks!


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