EnGenius ESR-9855G, User Manual

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4.1.1. DHCP Connection (Dynamic IP Address)
The WAN interface can be configured as a DHCP Client in which the ISP provides the IP address to the device. This is also known as
Dynamic IP.
Host Name : this is optional if you need to specify the host name for this router.
Use Unicasting : This option is normally turned off, and should remain off as long as the WAN-side DHCP server correctly provides an IP
address to the router. However, if the router cannot obtain an IP address from the DHCP server, the DHCP server may be one that works
better with unicast responses. In this case, turn the unicasting option on, and observe whether the router can obtain an IP address. In this
mode, the router accepts unicast responses from the DHCP server instead of broadcast responses.