This object stores the DHCP option 3 (default gateway) value the pool advertises to clients, held as a space-separated string of up to eight IP addresses rather than a single IpAddress, and it starts out empty until configured. Because it's a dedicated field outside the general option table, an admin must set it here directly if this pool's clients need a router address at all. For instance, setting the value to '192.168.10.1' would make every DHCP client leased from this pool use that address as its default route, while entering '192.168.10.1 192.168.10.2' would hand out two candidate gateways for the client to try.