"Router manufacturers" refers to companies that produce and sell routers, which are devices used to connect multiple devices to a network and enable data transmission between them. Full definition
The majority of router manufacturers now offer smartphone and tablet apps that you can use for first - time installation and subsequent tweaking. (pcworld.com)
Different router manufacturers refer to this feature in a wide variety of different ways, but it generally has «isolation» in its name. (howtogeek.com)
For their product, it's still the same router manufacturers that have built crappy hardware for the last 20 years building the product. (venturebeat.com)