{{ summaryTitle }}
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Routing{{ route_policy === 'full' ? 'Full tunnel' : route_policy === 'route_nopull' ? 'Local routes' : route_policy === 'block_redirect' ? 'No redirect' : 'Server routes' }} TLS key{{ control_channel === 'none' ? 'None' : control_channel }} Review{{ resultsReady ? values.review_count : '—' }}
Use a short operator-friendly name.
Example: vpn.example.com.
Valid ports are 1 through 65535.
UDP is the usual remote-access baseline.
Example: 10.44.0.0/16 or 10.55.0.0/16,vpn_gateway,50.
Use only with Windows clients that support the directive.
{{ windows_dns_guard ? 'Enabled' : 'Not added' }}
The neutral default adds no comments to the profile.
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The neutral default emits no custom directive.
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The chart renderer is unavailable. Profile and ledger artifacts remain available.

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WireGuard Config Generator Generate WireGuard server and client configurations with CIDR validation, route-scope warnings, and explicit placeholders for safer key handling.
VPN Tunnel Capacity Calculator Estimate practical VPN concurrent-user capacity from tunnel rate and packet overhead with gateway limits, busy-hour demand, and MTU risk checks.
MTU MSS Calculator Calculate a TCP MSS clamp from path MTU and encapsulation overhead, with IPv4 or IPv6 header budgets, floor checks and probe guidance.
IPsec Overhead Calculator Calculate a safe IPsec inner MTU and TCP MSS from the ESP profile and path budget, including NAT-T, padding and optional reserve bytes.

An OpenVPN connection succeeds only when the client profile agrees with the server on several independent choices. The transport and port must reach the listener, the tunnel device must match the intended network design, certificate verification must identify the server, and routing rules must send the right traffic through the tunnel. A profile can be valid text and still be operationally wrong.

The control channel authenticates peers and negotiates the session. The data channel carries tunneled traffic using a mutually supported cipher. A separate tls-auth, tls-crypt, or tls-crypt-v2 key can protect the control channel before ordinary TLS processing. Those materials are not interchangeable, and the selected mode must match the server.

  • Endpoint trust: a certificate authority establishes who issued the certificate, while server-role checks and optional name pinning narrow which certificate should be accepted.
  • Client identity: authentication may use a client certificate, a username prompt, or both. Each mode changes which credential material belongs in the profile.
  • Traffic scope: server-pushed routes, a requested full tunnel, blocked full-tunnel redirects, and local-only routes produce different privacy and reachability outcomes.
  • Compatibility: legacy cipher and compression settings may restore an older connection at the cost of weaker defaults and a larger attack surface.

Once private keys, certificates, shared TLS keys, or reusable usernames are inserted, an .ovpn file is sensitive. Store and transmit it like a credential. Placeholders make a draft safe to inspect, but they also make it impossible to import successfully until every required block is replaced.

Client-side generation cannot infer the server's policy. Confirm the listener protocol, certificate name, cipher negotiation, control-channel key mode, routes, and DNS behavior with the VPN administrator before distributing a profile.

How to Use This Tool:

Begin with a known server configuration or an administrator-provided connection brief. Guessing a compatibility setting can create a profile that imports but does not connect safely.

  1. Enter a short Profile name, server hostname or address, port, transport, and TUN or TAP device that match the listener.
  2. Choose the Routing policy. For local-only routing, add one IPv4 CIDR per line with an optional gateway and metric; for a full tunnel, enable the Windows DNS guard only on supported Windows clients.
  3. Select client authentication and decide whether certificate material will be inserted inline or referenced by local file paths.
  4. Match the server's control-channel key, data-cipher policy, TLS minimum, authentication digest, and certificate-name verification. Use legacy modes only for a known older peer.
  5. Review the generated profile and security findings. Replace every inline placeholder or confirm every external path before import, then test connection, routes, DNS, and access to intended resources.

Interpreting Results:

A zero placeholder count means the profile contains no marked certificate or key placeholders. It does not prove that referenced files exist or that the supplied material belongs to this VPN. Review findings identify deliberate exceptions such as no certificate-name pin, no control-channel key, legacy CBC fallback, or compression compatibility.

Import success is only a syntax check. A trustworthy result also needs a successful TLS handshake, the expected server identity, the intended route table, and working DNS without unintended leakage. Test from the actual client platform because directives such as block-outside-dns are platform-specific.

Technical Details:

The profile is assembled as ordered OpenVPN directives followed by certificate or key material. Required endpoint and session directives are always present. Authentication, routing, compatibility, and material directives appear only when their selected policies require them.

Transformation Core:

Policy choiceGenerated behaviorImportant consequence
Accept pushed routesUses normal client pull behavior.The server may supply routes and DNS options.
Request full tunnelEmits redirect-gateway def1 bypass-dhcp.Ordinary IPv4 traffic is requested through the VPN; optional Windows DNS blocking appears only here.
Ignore full-tunnel redirectsFilters pushed redirect-gateway.Other pushed options can still be accepted.
Use listed local routesEmits route-nopull and one normalized route per accepted IPv4 CIDR.Pushed routes and DNS options are rejected, so every needed route must be declared locally.
Certificate plus usernameAdds client certificate material, auth-user-pass, and auth-nocache.The user is prompted and credentials are not retained in the profile.
External materialWrites reviewed paths for the CA, client certificate, private key, and control-channel key as applicable.Paths with spaces are quoted; missing files are not detected.

Rule Core:

Baseline profiles emit client mode, the selected device and transport, endpoint retry behavior, persistent key and tunnel state, server certificate role checking, data-cipher negotiation, log verbosity, and a clean-exit notice for UDP.

RuleAccepted boundaryEffect
Remote endpointDNS name, IPv4 address, or bracketed IPv6 literal; port 1 to 65,535 inclusiveInvalid values stop generation.
Local routeIPv4 CIDR with prefix 0 to 32; optional gateway token or IPv4-shaped address; optional metric 0 to 999,999Invalid rows stop generation.
Server name pinRequired for exact-name or name-prefix verificationEmits verify-x509-name; role-only mode remains a review item.
Modern data ciphersAES-256-GCM, AES-128-GCM, and optionally ChaCha20-Poly1305Compatibility mode adds AES-256-CBC to negotiation.
Older peersExplicit OpenVPN 2.4 or 2.3 compatibility choiceAdds cipher AES-256-CBC; 2.3 also adds a data-cipher fallback.
Extra directivesOne line up to 240 characters without angle brackets or script-capable namesScript hooks and inline-block controls are rejected.

tls-auth adds client key direction 1, while tls-crypt and tls-crypt-v2 use their own key forms. Compression is omitted by default. The two compatibility choices add framing or decompression behavior only when explicitly selected; they do not silently enable ordinary payload compression.

Security Notes:

  • Replace placeholders only with material issued for the intended client and server.
  • Prefer server certificate role checking plus an exact or policy-appropriate name pin when the certificate naming scheme is known.
  • Keep compression omitted unless a documented migration requirement justifies the exception.
  • Remove CBC fallback after older peers are retired, and do not select TLS 1.0 for a modern server.
  • Protect completed profiles from shared URLs, browser history, screenshots, tickets, and broadly readable file storage.

References: