How to use Beetel 450TC3 as Modem only?

Aim is to limit bandwidth to selected devices.

Basically don't want the connected phones to use 16mbps. Want to restrict them to say 4mbps. Any way I can achieve that with a Airtel 450TC3 and TP-Link 841N(DD-WRT) as my hardware.
 
Yes. I've been using that method when I was with Beam/ACT.

But the feature is not working when I connect it to Airtel's 450TC3.
 
Hmm. Set Beetel to bridge mode, enter username and password in TP-Link and try?

Strange though. As per as the tplink is concerned, its still get an Ethernet WAN input.
 
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