Question about routing
Question about routing
You require PFsesne and the USG for compatibility reasons. Swapping the USG wouldn’t necessarily fix the issue, as it depends on specific configurations. I had to set up LAN-to-LAN connections between routers, which typically involves WAN ports. Unless the USG supports reconfiguration, that approach might not work. I’m not familiar with Ubiquiti products.
when a switch is active, if pfsense fails, the DHCP service becomes unavailable on the local or home side
Based on what I understand, using multiple DHCP servers can cause conflicts. You might want to install a backup server like a Raspberry Pi when needed, or configure static IP addresses on key network devices. For instance, my Desktop, NAS, and Plex server all use fixed IP addresses.
You're able to communicate even within the same network segment. RFCs for DHCP include sending an ICMP message before assigning an IP address, and if a reply comes back, the system selects a new address and repeats the process. The main challenge is ensuring devices can properly respond to ICMP, which often doesn't happen by default. This could lead to issues, particularly if Ubiquiti experiments with protocols they prefer.