I have BSNL wifi Modem.I am getting Reliance Broadband Connection.The ethernet from reliance does not fit into the
BSNL Wifi Modem.

1)Do we have any type of "adapter" which acts as the intermediate between relaiance wire and my BSNL wifi modem?

Or

2) Do I have to buy a new Netgear wifi router newly?(I checked that the ethernet from reliance fits into netgear router)