Planet Technology XRT-411 - Manual (Page 52)

Broadband Router User Guide
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"Renew" Clicking the "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 Broadband
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.