With this device can I connect to a hotel wifi, and then rebroadcast the connection using my own wifi ssid?

Yes, you could connect to hotel wifi and then share the internet with your own wifi ssid.

What are the major differences between openWRT and the version on this router?

The OpenWRT of SFT1200 is 1806 and the code is not fully open source. If you need a fully open-source travel router, please consider the GL-AR750S.

Do this router have openwrt installed on it?

The OpenWrt version of SFT1200 is 1806 and it is NOT Fully open source.

Can the Opal be used as a wi-fi to wired ethernet bridge? I don't want to repeat any wi-fi signal, Only connect to an existing wi-fi via wired etherne

There isn't an explicit mode for connecting as a wireless client bridge. A work-around to this may be to switch off both 2.4 and 5GHz wireless networks, while in the default router mode. This step should prevent other wireless devices from using the Opal as a repeater. One that is done, you can change the operational mode from router to WDS (if your main router supports it) or extender mode otherwise. Full disclosure: this approach works for me on the Beryl model, so I think there is a better than even chance it will also work on Opal, but that is an untested assumption right now.

ASIN	B09N72FMH5
Best Sellers Rank	#578 in Electronics ( See Top 100 in Electronics ) #6 in Computer Routers
Date First Available	December 7, 2021
Item Weight	10.6 ounces
Item model number	SFT1200
Manufacturer	GL.iNET
Product Dimensions	4.65 x 1.18 x 3.35 inches

Opal (GL-SFT1200) Cost-Effective Pocket Router

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Common Questions