This VPN glossary for beginners starts with one key distinction: a subscription provides configuration, a node is a connection option, a route describes the path traffic takes, a protocol defines how devices communicate, and split tunneling determines where requests go. These are different things, and no single term tells you whether a connection will work well.
“VPN client” can refer to either a system-wide tunneling tool or a proxy client. Both can change how traffic reaches its destination, but they may handle different portions of your traffic. Understanding the terms below is more useful for troubleshooting than repeatedly toggling settings.
How Subscription Links Differ from Paid Plans
“Subscription” can mean two different things in an app. A plan subscription covers billing and service benefits; a subscription link is an address the client uses to fetch connection settings. Buying a plan doesn’t automatically import its configuration into your client, and importing a configuration doesn’t mean your account still has data available.
A subscription link typically lets a client fetch node details in bulk. Depending on the format provided by the service, it may also include proxy groups, routing rules, and DNS settings. When node details change, refresh the subscription to get the latest configuration. Refreshing configuration and renewing a plan are separate actions; clicking “Update” doesn’t add data to your account.
Before importing, check that the link is compatible with your client. A client that can read node details may not support another client’s full rule configuration. If you see a format error, check the official guide and app version first. Don’t paste the link into an unfamiliar online converter.
Where Are Nodes, Ingress, and Egress?
A node is a selectable connection configuration in your client, usually containing a server address, authentication details, a protocol, and related parameters. A node name doesn’t necessarily represent a dedicated physical server; different nodes may share an ingress point or parts of the same route.
Ingress is the server location your client connects to first; egress is the source of requests seen by the destination website. A node’s listed region usually indicates its egress location, but the name itself isn’t proof. A destination app may also consider account region, payment details, and its own risk checks, so an egress IP’s location alone doesn’t determine access.
| Term | What it does | What it doesn’t tell you |
|---|---|---|
| Subscription link | Provides nodes or a complete configuration to the client | Whether your plan is active or a destination app will work |
| Node | Provides a set of connection parameters to choose from | Whether a server is dedicated, the egress is fixed, or the actual speed |
| Route | Describes the combination of ingress, transit path, and egress | Whether performance will be the same at all times |
| Protocol | Defines how the client and server communicate | Route quality, app permissions, or regional access |
| Routing rule | Decides whether an intercepted request connects directly, uses a proxy, or is blocked | Whether traffic the client hasn’t intercepted will follow the rules |
A client’s “latency” reading also depends on how it’s measured: connecting to an ingress server, establishing a proxy session, and reaching a test address through the proxy measure different things. Latency can help diagnose connectivity, but it isn’t download speed and doesn’t predict how AI tools stream responses or how smoothly a video will play.
Direct Connections, Relays, and IEPL Dedicated Lines Explained
In network topology, a direct connection usually means the client connects over the public internet straight to a server outside mainland China. With a relay, an ingress server receives traffic and forwards it to a later egress point. The relay path may use the public internet, dedicated transport resources, or both. “Relay” describes the forwarding setup, not a quality rating.
IEPL is an international Ethernet private line service designed to provide a dedicated Ethernet connection between specific endpoints. In consumer service descriptions, an “IEPL route” usually means that a section of the connection uses related dedicated-line resources—not that the entire path from your device to the destination website is a private line. Your local broadband, the route to the ingress point, and the network from egress to the destination can all affect performance.
There’s another meaning of “direct” to keep in mind: in routing rules, DIRECT usually means a request bypasses the proxy and connects through your local network. That’s not the same as a “direct-connection node.” The former is a routing decision; the latter may still be a proxy connection.
Bottom line: First check whether the target region and app work, then compare connection stability during the times you usually connect. Don’t draw conclusions from labels like “dedicated line,” “relay,” or a node name alone. Verify the route topology, protocol, and app experience separately.
What Do Common Protocols Do?
A protocol defines how the two ends of a connection authenticate, encapsulate, and transmit data. Its behavior also depends on the underlying transport, TLS configuration, and client implementation, so there’s no universal ranking of protocols independent of their configuration. The descriptions below are general information and don’t mean VPN41 offers every protocol listed.
- Shadowsocks: An encrypted proxy protocol often used to carry app traffic through a proxy. Support for particular transport features depends on the implementation and service configuration; Shadowsocks itself isn’t a system-wide VPN.
- VMess: A proxy protocol with authentication and encryption mechanisms that can work with different transport methods. A client’s support for VMess doesn’t mean it supports every transport option configured on the server.
- Trojan: Typically uses TLS to protect proxy communication between the client and server. Certificate validation is an important part of connection security; disabling it shouldn’t be treated as a routine fix.
- VLESS: A lightweight proxy protocol that doesn’t encrypt payloads by itself; it needs to be used with an appropriate security layer and transport configuration. Seeing the name VLESS doesn’t tell you how secure the complete connection is.
- Hysteria2 and TUIC: Both are based on QUIC and rely on UDP. Network restrictions on UDP can affect connectivity, and using these protocols doesn’t guarantee faster speeds on every network.
A practical approach for beginners: first confirm that your client supports the required protocol and transport, then use the complete parameters provided by the service. If you see an “unsupported protocol” error after importing, check client and core support before changing the protocol name at random. Renaming it won’t change how the connection works.
Split Tunneling Rules, Rule Mode, and Global Mode
Split tunneling chooses a route for each request. Rules may match conditions such as domain, destination IP, or process, depending on the client and how it runs. Many clients check rules in order and use a final fallback rule for requests that don’t match. Check your client’s documentation for its exact behavior.
Rule mode typically routes intercepted traffic according to your configuration—direct, through a proxy, or blocked. For example, local services might connect directly while international websites use a proxy group. Outdated rules or missing domains can cause partial failures: the main page may load while sign-in, images, or API requests fail.
Global mode typically sends intercepted traffic to a selected proxy or proxy group. It doesn’t mean every connection on your device necessarily goes through the proxy. If an app’s traffic isn’t intercepted by the client, changing modes won’t affect its route. Global mode can help troubleshoot rule issues, but it shouldn’t be treated as a universally more secure setting.
Proxy groups add a layer of selection between rules and nodes: a rule sends a request to a group, where you can select a node manually or use configured behavior such as automatic selection or failover. A successful test against one address only confirms that particular check passed; it doesn’t replace testing in the app you want to use.
System Proxy, TUN, and Platform Differences
A system proxy provides a proxy address to apps that support the setting. Browsers often follow the system proxy, but some apps, command-line tools, and background processes may use their own network settings. So “the website loads, but the terminal can’t connect” is entirely possible.
TUN mode uses a virtual network interface and routing to intercept IP traffic. Its coverage is generally broader, but still depends on routing configuration, exclusions, DNS settings, and system permissions. Enabling TUN doesn’t guarantee that all traffic goes through the proxy, and it isn’t the same as global mode: one handles traffic interception; the other determines what happens afterward.
On Windows and macOS, check whether the system proxy, virtual interface, and app-specific settings are consistent. Android and iOS clients often use the system VPN interface to intercept traffic, but seeing a VPN icon doesn’t tell you which proxy protocol is running underneath. On Linux, also check desktop proxy settings, terminal environment variables, and which system services the configuration covers.
Command-line programs may read HTTP_PROXY, HTTPS_PROXY, or ALL_PROXY, but support for variable names, address formats, and proxy types varies by program. Check the documentation for the tool you’re using and use the local listening address provided by your client. Don’t copy a port or credentials from someone else’s machine.
DNS Leaks and How to Check Whether You’re Connected
DNS translates domain names into addresses. Even after a proxy connection is established, DNS requests may still use your local network or be handled separately by your browser’s encrypted DNS, the system resolver, or the client’s DNS settings. If DNS requests take an unexpected path and reveal domain lookups that you intended to route through the proxy, check for a DNS leak.
A DNS resolver’s location differing from your egress location doesn’t automatically indicate a leak. Public DNS service deployment, caching, and forwarding can all affect test results. Encrypted DNS mainly protects queries in transit; it doesn’t guarantee that queries go through the proxy. Check configuration, logs, and actual request paths together rather than relying on a single location flag on a test page.
- Check configuration status: Verify separately that the subscription updates, your account benefits are active, and the node can connect. Don’t reduce these checks to a single “connected” status.
- Check what’s being intercepted: See whether the system proxy or TUN is enabled, whether the target app uses its own proxy, and whether any bypass settings are in place.
- Check egress and DNS: Check the egress IP in a browser that should use the proxy, then review DNS results alongside the client settings. Don’t upload subscription credentials.
- Test the feature you need: Try an actual AI tool conversation, video playback, website sign-in, or work collaboration task instead of just opening the home page.
- Check rules and logs: If something fails, see which rule matched the target domain and which proxy group was selected, then make a targeted adjustment. Redact authentication details before sharing logs.
If your browser works but other apps don’t, check what traffic the client intercepts. If global mode works but rule mode doesn’t, check the rules and DNS. If the node itself won’t connect, check for subscription updates, local network issues, and client support. This helps avoid changing protocols or nodes without a clear reason.
Match Plans and Client Settings to Your Needs
The terminology matters most in real-world use. AI tools depend on steady responses and stable sessions; for streaming, check the available catalog and playback in the target app; international websites may require reliable sign-in, page assets, and APIs; remote work calls for attention to meetings, file collaboration, and your organization’s network access requirements. Personal proxy settings don’t replace your company’s security policies.
- ✅ Check the configuration: Make sure the subscription format matches your client, and keep sensitive links somewhere secure.
- ✅ Check the route: Distinguish ingress, egress, and topology; don’t treat a node name as proof.
- ✅ Test the app: Check your actual workflow instead of relying only on a latency indicator or connection status.
- ✅ Check the rules: Confirm which requests connect directly, which use a proxy, and how unmatched requests are handled.
- ✅ Check your data allowance: Distinguish data that resets monthly from data packages that are used until they run out, then choose based on how often you use the service.
For example, VPN41 monthly plans include ¥9.9/month for 60GB, ¥18/month for 250GB, and ¥28/month for 500GB. Data resets monthly on the activation date, and mid-cycle upgrades are prorated for the remaining days. Data packages cost ¥158/300GB, ¥358/1000GB, and ¥658/3000GB; they last until used and never expire. Neither billing option should be confused with a “subscription link,” which is a configuration entry point.
VPN41 covers 100+ countries and 180+ routes, with no limit on the number of devices connected at once; unlimited devices doesn’t mean unlimited data. Windows, Android, iOS, macOS, and Linux are supported. Follow the guide for your platform. No email address is required; create an account with a username and password. You can request a full refund for any reason within 30 days of your first payment. See the plans and pricing page for plan details, or read the guide to routes and protocols for configuration basics.
Quick recap: Use your subscription to get the right configuration, choose a node, check what traffic the client intercepts, then use routing rules to direct it and test in the target app. Break down the process to find out whether a problem is with your account, configuration, network, or app—instead of assuming the VPN simply failed to connect.