Behind the words “throttling” and “blocking” is a concrete technology. Without unnecessary theory, we explain exactly how operators’ equipment decides which traffic to pass and which to cut - and why encryption alone isn’t enough for a resilient connection.
TSPU: where the filter sits
TSPU stands for “technical measures to counter threats” - equipment that has been installed in Russian operators’ networks since 2021. Physically it sits between you and the rest of the internet: all your traffic passes through it.
The easiest way to picture TSPU is as a border checkpoint on the way out of the operator’s network. Not a single packet of data drives past it. It’s TSPU that carries out the decisions to throttle or block - the “hands” of the filtering system.
DPI: how the filter makes its decision
DPI stands for deep packet inspection. Where ordinary routing looks only at the address “where to deliver,” DPI looks inside the connection and analyzes its nature. It’s the “brain.”
Based on the analysis, traffic can be passed, throttled, or cut. The decision is made on several criteria at once - and that’s the key point.
Why encryption alone isn’t enough
Many think: if traffic is encrypted, it can’t be seen. That’s only partly true. The content really is hidden, but two important signals leak out even with encryption.
That is, from encrypted traffic you can still tell which service you’re connecting to and by what method. So modern secure connections, such as Russian VPN by Tainet, solve two tasks at once: they hide the content and disguise the very fact that this is a “special” connection (exactly how - below).
How this is countered technically
Protocols like VLESS+REALITY disguise the connection as an ordinary visit to a popular website: to DPI it looks like routine secure web traffic. The signature doesn’t give away a “special” connection, and the SNI field doesn’t stick out with a suspicious domain.
But even perfect protocol disguise won’t save you if the entry point’s IP address is already in bad standing with the equipment - it can be cut by address, without bothering with the protocol.
Where to get a stable connection
Russian VPN by Tainet works at the junction of both tasks. The VLESS+REALITY protocol hides the type of traffic, while a fleet of entry points is managed to keep the connection alive when individual addresses come under filtering.
For you, all this mechanics stays under the hood: you just connect and get a stable, encrypted channel. How it works on your network - you can test for free: sign up in the Telegram bot or in your account, then from $0.10 a day.
Tainet - a stable connection with no complicated setup. Sign up through the Telegram bot or in your account, support is real people, from $0.10 a day.
Try it →Frequently asked questions
Are TSPU and DPI the same thing?
No. TSPU is the physical equipment (where the filter sits), while DPI is the traffic-analysis technology (how the filter thinks). DPI runs on TSPU.
Does DPI see the content of my messages in encrypted traffic?
The content itself - no. But it sees accompanying signals: the domain in the SNI field and the protocol signature, by which it can tell what you’re connecting to.
Why does the connection sometimes work and sometimes not, with the same protocol?
Most often it’s the reputation of the entry point’s IP address. The protocol didn’t change, but the address may have come under filtering - so working with addresses matters too, not just disguise.
Bottom line
TSPU is where the filter sits, DPI is how it thinks. Filtering looks at address, domain, protocol, and behavior at once, so encryption alone isn’t enough: you need both protocol disguise and an entry point with a good reputation. Understanding the mechanics helps you choose a tool deliberately rather than at random. If the technical side matters, there is a breakdown of which protocols hold up better against blocking.
If this article describes your situation, Tainet handles it without the technical hassle: connect through the Telegram bot or in your account, from $0.10 a day. Questions go to support - we answer fast.
