On Tuesday, March 5, 2019 at 11:34:27 PM UTC-8, bob prohaska wrote:
I've been given an old 2wire 1701HG ADSL modem/router...

I was able to do a factory reset, connect a computer and ping the default
address of 192.168.1.254. However, a web browser pointed at that address
brings up nothing useful.

My 2701HG has the control panel at 192.168.0.1/setup which might be worth a try.
I downloaded firmware from the local ISP that improved the available features
noticeably, but that was 5 years ago; they've decided these old models are obsolete
now (probably because the WiFi is WEP-only).

Depending on the ISP, yours might have some custom firmware. Only the original
supplier ISP would be able to document it or supply updates.