To connect a Tomato-family router to your own OpenVPN server, configure the router as an OpenVPN client using a client profile issued by the server. In FreshTomato, go to VPN > VPN Tunneling > OpenVPN Client, copy the server’s address, port, transport and authentication settings, paste the matching CA certificate, client certificate, private key and any static key, then save and click Start Now.
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The setting that determines whether every device uses the tunnel is Redirect Internet Traffic. Choose All for a full-tunnel design, or use split routing when only selected networks should traverse the VPN. A full tunnel also changes DNS routing, so the server must provide a reachable resolver and the router must accept it.
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There are two OpenVPN roles in this arrangement:
- Tomato router: the OpenVPN client. It initiates the connection and normally provides the tunnel for devices on its LAN.
- Remote machine or gateway: the OpenVPN server. It authenticates the router, assigns a tunnel address, pushes routes and may provide internet egress or access to a private LAN.
The server profile is authoritative. Its remote hostname or IP address, port, UDP or TCP transport, tunnel type, certificates, cipher and control-channel protection must be reproduced on the router. A setting that looks reasonable in Tomato is still wrong if it does not match the server.
A typical topology is:
LAN devices → Tomato OpenVPN client → encrypted tunnel → OpenVPN server → internet or private server-side networksConnecting successfully is not the same as routing useful traffic. The tunnel can be established while internet forwarding, private-subnet routes or DNS remain misconfigured. Plan those outcomes before you enable the client.
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Gather the prerequisites
Have these items ready before opening the router interface:
- A Tomato-family router with an OpenVPN client. FreshTomato is the actively maintained Tomato community fork identified for this workflow; other forks use similar concepts but may label fields differently.
- An already configured OpenVPN server reachable from the router’s WAN connection.
- A client profile created specifically for this router, with a unique client identity rather than a certificate shared with another device.
- The profile’s remote hostname or IP address, port, transport (
udportcp-client), and tunnel type (usuallyTUN). - The complete CA certificate, client certificate and client private key.
- The complete
tls-authortls-cryptstatic key when the server uses one, plus its key direction if the profile specifies one. - A routing decision: send all internet traffic through the server, send only selected destinations, or reach a server-side private LAN without changing the normal internet route.
Keep the original .ovpn file open while configuring. Embedded blocks such as <ca>, <cert>, <key> and <tls-auth> contain exact material; copying only part of a block or substituting a different certificate will prevent authentication.
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Routing determines what the router does after the tunnel comes up. Select the design that matches the server’s purpose rather than enabling every option by default.
| Design | Tomato approach | What must work on the server |
|---|---|---|
| Full tunnel | Set Redirect Internet Traffic to All. | Forwarding and NAT (or an equivalent return route) for the router’s LAN traffic, plus a DNS service reachable through the tunnel. |
| Split tunnel | Leave the all-traffic redirect disabled and use only the routes required for selected destinations. | Routes and forwarding for each selected subnet; ordinary internet traffic continues through the WAN. |
| Private-LAN access | Use routes for the server-side LAN without replacing the default internet route. | A route from the server to that LAN, forwarding rules and a return path to the Tomato LAN. |
OpenVPN’s redirect-gateway behavior is broader than changing the default route. When it is applied, all client IP traffic is sent through the server and DNS queries are routed through the VPN as well. Therefore, enabling a full tunnel without a usable server-side DNS path commonly produces a connected tunnel with broken name resolution.
Create NAT on tunnel is a separate design choice. NAT can hide the Tomato LAN behind the tunnel address, which is useful when the server is prepared to provide internet egress but has no route back to the LAN. If you need transparent, routed access to remote private networks, confirm the server-side routing design before relying on NAT.
Export a dedicated client profile from the server
- Create a unique client identity for the router on the OpenVPN server. The client certificate and private key must be a matching pair signed by the CA that the server trusts.
- Generate or download the complete client profile. Preserve every directive, including
remote, transport, authentication, cipher or data-cipher settings, certificate references and any static-key directive. - Decide whether the router will use certificate authentication only or certificate plus username and password. If the profile contains
auth-user-pass, obtain the credentials through the server administrator’s normal secure process. - Check whether the profile uses
tls-authortls-crypt. Copy the corresponding key and note the required direction, often outgoing direction1. - Do not replace a server-issued CA, certificate, private key or static key with one from another profile. These values are cryptographically related and must match the server’s PKI and control-channel settings.
OpenVPN PKI starts with a certificate authority and issues certificates to the server and clients. The router therefore needs the CA certificate to validate the server and its own certificate and private key to authenticate itself.
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Open the FreshTomato OpenVPN client page
Sign in to the router’s web interface and navigate to VPN > VPN Tunneling > OpenVPN Client. FreshTomato places the client configuration on Basic, Advanced and Keys tabs. Other Tomato forks expose comparable fields, but labels, cipher lists and available routing controls can differ.
Configure one client instance at a time. If the router offers multiple client slots, use a separate slot for a separate server profile rather than mixing values from different servers.
Complete the Basic tab
Use the server profile as a field-by-field map. The following settings cover the options that most often determine whether the tunnel can start.
Start with WAN
Enable Start with WAN when the tunnel should start automatically after the router has a working WAN connection. Leave it off while testing if you want to prevent repeated connection attempts during setup.
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Interface Type
Select TUN for routed IP networking unless the server explicitly requires a TAP bridge. TUN is the usual choice for a routed client-to-server design; changing it to TAP without a matching server configuration will not create a working bridge.
Protocol
Match the profile exactly: use UDP when the profile specifies udp, or TCP client mode when it specifies tcp-client. UDP is common, but the server’s listener and policy decide the correct transport. Do not switch transports merely because one appears faster.
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Server Address and Port
Copy the hostname or IP address from the profile’s remote line into Server Address, and copy the associated port into Server Port. If the profile lists more than one remote endpoint, use the endpoint permitted by your server design and add alternatives only if the Tomato interface supports them.
Firewall
Automatic is a common Tomato choice. Use a custom firewall policy only when your topology requires rules beyond the firmware’s automatic handling, and document those rules so they can be reviewed if the tunnel connects without passing traffic.
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Authorization Mode
Select TLS for certificate-based OpenVPN authentication unless the server uses another mode supported by your firmware. TLS mode is the setting that corresponds to a CA, client certificate and client private key.
Username and password authentication
Enable Username/Password Authentication only when the server profile requires auth-user-pass. A username and password do not replace the CA, client certificate or private key when the server requires both certificate and user authentication.
Create NAT on tunnel
Enable Create NAT on tunnel when LAN clients should be translated behind the router’s tunnel address and the server is designed to receive that translated traffic. For routed access to remote LANs, verify the server’s routes and return path first; NAT can hide the original LAN addresses and change how remote hosts reach them.
Control-channel protection
Choose the mode that matches the profile’s tls-auth or tls-crypt directive. Paste the matching static key on the Keys tab and set the key direction exactly as specified. A tls-auth key and a tls-crypt key are not interchangeable, and a correct key with the wrong direction still causes the handshake to fail.
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Set Advanced options for routing, DNS and verification
Redirect Internet Traffic
Choose All when every LAN client’s internet traffic should use the server. This applies the full-tunnel behavior associated with redirect-gateway. For a split-tunnel design, leave the all-traffic redirect disabled and add only the routes required by the server profile or your administrator’s instructions.
When you select All, test DNS as part of the same change. A public-IP check alone cannot prove that domain names will resolve.
Accept DNS Configuration
Select the mode that matches your DNS plan. If the server pushes DNS settings, the router must accept them and the pushed resolver must be reachable through the tunnel. If you intentionally use another resolver, ensure your routing and firewall policy permits it without leaking queries onto an unintended path.
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Verify Certificate
Enable the equivalent of remote-cert-tls server when the firmware exposes that option. This verifies that the peer presents a certificate appropriate for an OpenVPN server instead of merely accepting any certificate signed by the CA.
Additional directives
Add only directives required by the server profile or supplied by the administrator. Examples include persist-key, persist-tun, tls-client, auth, data-cipher settings, remote-cert-tls server and an mssfix value provided for the connection. Provider-specific directives copied from an unrelated profile can conflict with the server or with Tomato’s own generated options.
Paste certificates and keys exactly
Open the Keys tab and paste complete PEM blocks into their corresponding fields. Keep the header and footer lines; do not add quotation marks or remove line breaks.
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- Certificate Authority: paste the content inside the profile’s
<ca>block, including-----BEGIN CERTIFICATE-----and-----END CERTIFICATE-----. - Client Certificate: paste the client certificate from the profile’s certificate block when FreshTomato provides a separate field.
- Client Key: paste the matching private-key block into the client-key field. Treat this material as a secret.
- Static Key: paste the complete
<tls-auth>or<tls-crypt>block when the server uses one, and set the direction required by the profile.
Some profiles reference external files instead of embedding blocks. In that case, use the actual contents of the referenced files and place each item in the matching Tomato field. A CA block pasted into the client-certificate field, or a client certificate pasted without its private key, produces certificate or TLS errors rather than a usable connection.
Save, start and read the status page
- Review the Basic, Advanced and Keys tabs against the server profile.
- Click Save to write the configuration.
- Click Start Now to initiate the client.
- Open the client’s Status page and wait for an established session rather than judging success from a brief start message.
- Record the tunnel address and connection time shown by the firmware if you need to correlate router behavior with server logs.
A successful status page should show an established session and a tunnel address. The exact wording varies by Tomato fork. Repeated reconnects, an empty tunnel address or a status that immediately returns to stopped indicates that the client did not complete negotiation.
Verify the result from a LAN device
Run these checks in order. Testing from a device behind the router confirms that the intended LAN traffic, not just the router’s own management traffic, follows the design.
- Confirm session state: return to the OpenVPN client status page and verify that the session remains connected rather than cycling through reconnects.
- Check public IP: from a LAN client, use an IP-checking service. With full-tunnel routing, the observed public address should be the server’s egress address rather than the normal WAN address.
- Resolve a normal domain: open a website or use the client’s normal DNS diagnostic. If names fail while numeric IP connections work, investigate the pushed resolver, the router’s Accept DNS Configuration choice and firewall reachability.
- Test a private destination: connect to an address on the server-side LAN or another intended private subnet. This verifies that the required route and forwarding rules exist; a changed default route alone does not create access to every remote network.
- Test failure recovery: stop the OpenVPN client and confirm that traffic returns to the ordinary WAN path before changing production routing or firewall settings.
Test both a destination that should use the tunnel and one that should not. In a split-tunnel design, ordinary internet traffic should retain its WAN path while the selected private routes use OpenVPN.
Troubleshoot by symptom
TLS handshake or certificate errors
- Check the router’s clock. Certificate validation can fail when the device time is substantially wrong.
- Verify that the CA block is complete and belongs to the server that issued the client certificate.
- Confirm that the client certificate and private key are a matching pair and that the certificate has not expired or been revoked by the server.
- Compare Verify Certificate behavior and any server-name verification directive with the profile.
- Recheck whether the server uses
tls-authortls-crypt, then verify the static key and direction. Changing DNS will not repair a wrong CA or static key.
The tunnel connects but there is no internet
- Confirm that Redirect Internet Traffic is set to All when a full tunnel is intended.
- Check Create NAT on tunnel against the server’s forwarding and NAT design.
- Verify that the server forwards client traffic and has an egress path to the internet.
- Inspect the router’s route table or status information to ensure the default route changed only when that was the intended design.
Internet works but the private LAN is unreachable
A full-tunnel default route does not automatically advertise every private subnet. The server must push or otherwise provide the route, permit forwarding to that LAN and have a return route to the Tomato LAN. If NAT is disabled for routed access, ensure the remote LAN knows how to return traffic to the router’s client subnet.
DNS fails while IP addresses work
- Inspect the DNS options pushed by the server.
- Confirm that Accept DNS Configuration is set to use the intended pushed or configured resolver.
- Check that the resolver’s address is reachable through the tunnel and permitted by server and router firewall rules.
- In a full-tunnel configuration, remember that DNS queries are expected to follow the VPN; a resolver available only on the ordinary WAN may no longer be reachable by design.
Frequent reconnects or slow pages
Compare the router’s protocol, authentication, cipher and data-cipher settings with the server profile. Do not mix a cipher directive from another configuration. If negotiation succeeds but larger pages stall, ask the server administrator for the correct MTU or MSS guidance and apply only the supplied value.
The client starts after a reboot but not manually
Check Start with WAN, confirm that the WAN has an address before the client launches, and review whether the router saved the profile in the intended client slot. A startup race can leave a client attempting to connect before DNS or the WAN gateway is ready; restarting the client after WAN availability distinguishes that condition from a certificate or routing error.
Compare the main configuration choices
| Choice | Use it when | Important consequence |
|---|---|---|
| Full tunnel versus split tunnel | Full tunnel for all internet traffic through the server; split tunnel for selected destinations only. | Full tunnel changes the default route and sends DNS through the VPN; split tunnel preserves the normal WAN route for destinations without explicit VPN routes. |
| UDP versus TCP | Use the transport selected by the server profile. | The router and server must listen and connect using the same transport and port. |
| Certificate-only versus certificate plus username | Certificate-only when the server requires PKI alone; combined authentication when the profile contains auth-user-pass. |
Combined authentication still requires the matching certificate material. |
tls-auth versus tls-crypt |
Use the control-channel protection named by the server. | The key type and direction must match exactly; they are not interchangeable. |
| Router NAT versus routed LAN access | NAT when the server expects translated client traffic; routed access when remote networks need the original Tomato LAN subnet. | NAT simplifies return routing but hides LAN addresses; routed access requires explicit routes and forwarding on both sides. |
| Pushed DNS versus explicitly configured DNS | Use pushed DNS when the server supplies a resolver; configure another resolver only when your routing and security policy allows it. | The selected resolver must remain reachable after the tunnel changes the traffic path. |
Operate the connection safely
- Keep one dedicated client identity for the router so the server can revoke or replace it without disrupting unrelated devices.
- Protect the client private key and static key as credentials. Do not paste them into public support posts or reuse them in another client profile.
- Save a copy of the working profile and note which Tomato fields came from each directive. This makes certificate renewal and troubleshooting less error-prone.
- When the server administrator changes its port, transport, CA, cipher policy or control-channel protection, update the router from the new profile instead of guessing which field changed.
- After every routing change, repeat public-IP, DNS and private-subnet tests from a LAN device, then stop the client once to confirm the WAN fallback behavior.
With the server-issued profile copied exactly, matching keys installed, and routing and DNS tested as separate goals, a Tomato router can provide a predictable OpenVPN connection for the devices behind it.
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