Dynamic IPs in IPv4 Local network(s)?

[brianb08]

I have OpenVPN setup to route traffic from VPN clients to a handful of networks and IP address listed in the IPv4 Local network(s) field.  All is working fine.  Some of those IPs though are dynamic IPs (AWS ELBs and similar, things I can't make static).  Is there a way to list hostnames for IPv4 Local network(s)?  Or a way to script the setup of this field with a cron job on the pfSense box?

Any ideas welcome!
Thanks,
Brian

[viragomann]

You can get it out from the ARP table.
On command line you may run

arp -a -i <interface></interface>

[brianb08]

Thanks for the response.  I'm not looking to get the list of IPs… I'm looking to set it, and update the settings on a schedule based on DNS lookups.