What is an International Internet Gateway, and why does your ISP's choice matter?

When someone in Dhaka opens a video, the request travels from their ISP, across a national transmission network, to an International Internet Gateway. From there it crosses a submarine or terrestrial cable to reach servers abroad, unless the content is already cached locally.

Most of the internet Bangladeshis use every day is hosted outside the country. That makes the gateway layer the single most important hop in the chain: it decides how much international capacity is available, which physical routes carry it, and how quickly popular content is reached.

The gateway is also where a lot of the engineering lives that end users never see: peering with global content networks, cache servers for the biggest platforms, and the routing policy that decides which path a packet takes when one route fails.

Bangladesh separates the internet supply chain into licensed layers. The Bangladesh Telecommunication Regulatory Commission (BTRC) issues each licence, and a company can hold more than one. Here is what each layer actually does:

The distinction matters because the layers fail in different ways. An ISP outage affects one provider's customers. A gateway problem can affect every ISP that buys from that gateway. When you choose an ISP, you are also, indirectly, choosing the IIG behind it.

Mango holds an IIG licence (2008, the first private-sector IIG in Bangladesh), an ITC licence (2012) and an ISP licence (2013). Holding the gateway, the terrestrial route and the access licence under one roof is what lets one team own a problem end to end.

Bangladesh reaches the world through two kinds of physical path: submarine cables that land on the coast, and terrestrial cables that cross the Indian border. Each has failed before. Submarine systems are cut by anchors and dredging; terrestrial routes are affected by fibre cuts and upstream outages.

A gateway with a single route turns any one of those incidents into a national outage for its customers. A gateway with diverse routes reroutes traffic in seconds, with some loss of capacity but no loss of service. Mango holds rights of use on the SEA-ME-WE 4 and SEA-ME-WE 5 submarine systems and operates terrestrial capacity through its ITC licence, so traffic has more than one way out.

The second part of diversity is content. Mango interconnects directly with Akamai, Amazon, DE-CIX, Equinix, Meta, Google and Zenlayer. When the platforms your subscribers use most are one hop away, or cached in Dhaka, a cable incident abroad affects far less of the traffic people notice.

Whether you run an ISP or you are an enterprise buying a dedicated link, these questions separate a gateway from a reseller:

1. 01Which physical routes carry my traffic? Ask for the submarine systems and terrestrial paths by name, and whether they are on separate physical paths.
2. 02What happens when one route fails? A real answer describes how rerouting works and how much capacity survives.
3. 03Which content networks do you interconnect with directly? Direct peering and local caches change the experience for most traffic.
4. 04Who answers at 3am? Ask for the escalation path: operations desk, senior engineer, head of network operations.
5. 05Which licences do you hold? IIG, ITC and ISP licences from BTRC are public facts. A provider should be able to name them.
6. 06Can capacity grow on my timeline? Committed capacity with a clear upgrade path beats a headline number you can never reach.