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[docs] add section about client interaction with Telegram DCs

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Nick Parfyonov
2026-04-14 14:59:04 +03:00
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docs/FAQ.en.md
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@@ -157,6 +157,24 @@ Keep-Alive: timeout=60
### Why do you need a middle proxy (ME)
https://github.com/telemt/telemt/discussions/167
## How clients interact with Telegram DCs
When you register a Telegram account, it gets permanently bound to one of Telegram's data centers (DCs).
It is deciced beforehand by Telegram based on the phone number's region.
This DC becomes your **home DC**: all content you upload (photos, videos, files, messages) is stored there.
Your client authenticates on it with every connection.
For example, if your account is registered on **DC2**, your client will always connect to DC2 first.
When you open a chat with another user whose home DC is **DC5**, your client opens an additional connection to DC5 to download their media.
Those cross-DC requests are normal and happen constantly.
> [!WARNING]
> Because every session is anchored to your home DC, an outage there causes other DCs to be unavaliable.
> If your home DC is DC2 and DC2 goes down, you **cannot** reach DC5 even though DC5 itself is perfectly healthy.
> The client has no valid session to route the request through.
This is also why an MTProxy only needs to reach Telegram's DC infrastructure as a whole.
The proxy itself doesn't care which DC your account lives on. The client negotiates the correct DC through the proxy after connecting.
### How many people can use one link
By default, an unlimited number of people can use a single link.
However, you can limit the number of unique IP addresses for each user:
@@ -164,7 +182,8 @@ However, you can limit the number of unique IP addresses for each user:
[access.user_max_unique_ips]
hello = 1
```
This parameter sets the maximum number of unique IP addresses from which a single link can be used simultaneously. If the first user disconnects, a second one can connect. At the same time, multiple users can connect from a single IP address simultaneously (for example, devices on the same Wi-Fi network).
This parameter sets the maximum number of unique IP addresses from which a single link can be used simultaneously. If the first user disconnects, a second one can connect.
At the same time, multiple users can connect from a single IP address simultaneously (for example, devices on the same Wi-Fi network).
### How to create multiple different links
1. Generate the required number of secrets using the command: `openssl rand -hex 16`.