How Domain Blocking Works on Bangladeshi ISPs

Once you know which layer is doing the blocking, the right fix is obvious — and so is the reason the wrong fix did nothing.

It is the address that gets blocked, not the site

Blocking is applied to individual domain names. That is why one address stops loading while another belonging to the same site opens instantly, and why a site can be perfectly healthy for most of the world and unreachable from one network.

The layers, easiest to hardest

DNS-level — the common one

Your provider’s DNS refuses to answer for that name. Symptom: an instant “can’t be reached”. Fix: change your DNS. Minutes, free, no speed cost.

SNI or IP-level — less common

The name resolves, then the connection is dropped as it is made. Symptom: a long hang, then a timeout. A DNS change will not help. Fix: a different official address.

Transparent proxy

You get a notice page instead of the site. Fix: a different official address, or a VPN if you need that specific one.

Why it often follows you to mobile data

Directives usually go to every operator at once, so the same address can be blocked on your broadband and your SIM within days of each other. That is not a sign that your device is infected or that you are on a fake site — it is the same instruction reaching two networks.

Why several addresses exist

Because one address is a single point of failure. Running several is what keeps a site reachable when one gets blocked — it is ordinary practice, not a sign of anything suspicious. It does mean you should check an address against the official list rather than trusting whatever a search result offers, since look-alike sites rely on exactly this habit of hunting for a new link.

What actually helps, ranked

1. A different official address — instant, nothing to configure.
2. A DNS change — one minute, fixes the most common layer, no speed cost.
3. The other network — Wi-Fi vs mobile data.
4. A VPN — works at every layer, but it is slower and it is the last resort, not the first.

A 30-second test that tells you which layer you are on

You do not need any tools to identify the block type — the symptom names it. Run these in order and stop at the first that applies:

1. Does it fail instantly with “can’t be reached”? DNS-level. Change your DNS and it comes back.
2. Does it spin for many seconds, then time out? SNI or IP-level. A DNS change will not help; use a different official address.
3. Do you land on a provider notice page? Transparent proxy. Different address, or a VPN if you must have that exact one.
4. Does it work on mobile data but not Wi-Fi, or the reverse? Confirms a block rather than an outage, whatever the layer — the site is up and one operator is filtering it.

How it differs across networks here

Blocking directives generally reach the large mobile operators and the broadband providers around the same time, but not the same minute, so it is normal to see an address die on your SIM a few days after it stopped on your home Wi-Fi, or the other way round. This is why “it worked yesterday” is not evidence that today’s failure is your fault. When both your broadband and your mobile data block the same address, that address has simply been added to the list on both networks — switch to another official address, or let the app resolve one for you.

Why the official app is the most block-resistant route

Every fix above works at one layer. The Android app on movielinkbd.app is different in kind: instead of depending on any single domain that a provider can add to a block list, it resolves the currently-working address itself, in the background, and updates when one is blocked. For someone who just wants the problem to stop recurring, installing it once is more durable than memorising DNS steps — the domain problem effectively disappears because the app stops relying on a fixed domain.