Hawking Technology HWR54G - Manual (Page 46)

Wireless Router User Guide
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"Renew" "Renew" button will attempt to re-establish the connection and
obtain an IP Address from the ISP's DHCP Server.
• If an IP Address has been allocated to the Wireless Router (by
the ISP's DHCP Server), this button will say "Release". Clicking
the "Release" button will break the connection and release the IP
Address.
Refresh Update the data shown on screen.