Wireless Bridge is a mode in which your wireless router can directly connect to a secondary wireless Access Point. This feature allows you to expand the range of the wireless network broadcasted by your main wireless router. This article will guide you on how to set up wireless bridge. Wireless bridging works with the following models only:
Wireless Bridging Overview | Answer | NETGEAR Support Nov 28, 2016 Access Point Vs. Wireless Bridge – Router Switch Blog May 10, 2012
Unfortunately, WRT120N doesn't have a WDS option to become a wireless bridge. Although there are some 3rd party firmware that adds wireless bridge option to routers such as DD-WRT. There's always an option though. You need to buy a router with wireless repeater option or "AP + client mode" configuration.
The bridge router did not need to be connected to the modem in order to be set up. Anyway, it looks like you got far enough to convert it into a wireless bridge, so all you need to do now is reconnect the primary router to the modem. The bridge router should, then, connect wirelessly to the primary router. Use a Bridge to Expand Your Local Network
Wireless Bridge User Guide - Hikvision
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