In the lab we already have internet access for future LoRaWAN↔internet gateway functionality
The intial thoughts about gateway hardware is to go the DIY route to gain as much knowledge about the components and the TTN/LoRa technologies as possible.
The iC880A is A 868MHz LoRa concentrator board using SX1301 and 2 SX1257 chips which is available now for EUR ~150.
The DIY gateway from ttn-zh (Zürich) based on the iC880A looks like an easy, capable and and relatively cheap solution (blogpost about this solution).
Ttn-liv (Liverpool) has forked this setup, it should be investigated how this differs from ttn-zh.