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Ubiquiti edgerouter x site to site vpn setup guide for IPsec site-to-site connections between remote networks using EdgeRouter X and EdgeOS

Yes, you can set up a site-to-site VPN on the Ubiquiti EdgeRouter X.

If you’re here, you’re probably looking to link two or more remote networks securely so devices at either end can talk as if they’re on the same LAN. This guide walks you through a practical, step-by-step approach to configuring an IPsec site-to-site VPN on the EdgeRouter X, using EdgeOS, with real-world tips, common pitfalls, and testing steps. You’ll get a solid, reliable tunnel between your sites, plus a roadmap for monitoring and maintenance. And if you’re shopping for extra privacy or secure browsing while you tinker, consider this NordVPN deal:

Useful URLs and Resources unlinked in-text for quick reference

Introduction overview

What you’ll learn: why IPsec site-to-site is typically the best fit for Edgerouter X, a practical configuration workflow both CLI and GUI options, how to set up phase 1 and phase 2, how to carve traffic with route policies, how to handle NAT and firewall rules, how to test the tunnel, and how to troubleshoot common issues.
Real-world notes: EdgeRouter X is a compact, cost-effective device that can handle small-to-medium site-to-site VPNs with stable performance when you tune the IPsec parameters, keep the firmware up to date, and design proper subnets that don’t overlap.
Quick-start checklist: firmware check, public IPs or dynamic DNS ready, LAN subnets planned, PSK or certificate decision, firewall rules in place, and a plan for monitoring.

Body

Understanding site-to-site VPNs and why EdgeRouter X handles them well

Site-to-site VPNs connect two distinct networks over the internet so devices on either side can talk as if they’re on the same LAN. For most small offices or remote branches, IPsec is the go-to protocol because of its wide support, robust security features, and compatibility with most firewalls and routers, including EdgeRouter X.

Key concepts you’ll use:

IPsec tunnel: a protected path between the two networks, typically with two tunnels for redundancy or a single tunnel depending on your topology.
Phase 1 IKE: how the peers authenticate and establish the secure channel. You’ll choose an IKE version IKEv1 or IKEv2 and a cipher suite.
Phase 2 IPsec: how traffic is encrypted and what traffic is allowed through the tunnel local and remote subnets.
Local vs remote subnet: the networks at each site that you want to reach through the VPN.
NAT traversal: how to handle private addresses when traffic moves over the public internet.

Data points that help justify the approach:

IPsec remains the backbone of most enterprise site-to-site VPNs because it’s widely supported across vendor devices, including EdgeRouter X. It provides encryption, integrity, and authentication with relatively light overhead for typical remote sites.
For small deployments, a single IPsec tunnel with a solid pre-shared key PSK or certificate-based authentication is usually enough, with careful routing rules to ensure only necessary traffic traverses the tunnel.
Properly designed subnets that don’t overlap across sites simplify routing and reduce tunnel churn.

Prerequisites and gear you’ll need

Ubiquiti EdgeRouter X with the latest EdgeOS firmware, preferably a stable release with bug fixes for IPsec.
Two public-facing endpoints: at least one with a static IP, or both behind dynamic IPs with a reliable dynamic DNS setup.
Remote site details: the remote LAN subnet e.g., 192.168.2.0/24 and the remote public IP or FQDN.
Local site network details: your own LAN subnet e.g., 192.168.1.0/24 and the EdgeRouter X LAN interface eth1 or eth2, depending on your setup.
Authentication method: pre-shared key PSK is simple and common. or you can use certificates if you want a stricter approach.
Firewall and route planning: a plan for which traffic should go through the tunnel and which traffic should stay local, plus rules that allow VPN-related traffic ISAKMP, ESP, UDP 500/4500.
Optional but recommended: a static route plan for the remote subnets and a plan for monitoring the VPN status.

Pro tips:

Make sure the EdgeRouter X has an uninterrupted power source and consider a small UPS for clean failover.
If you’re behind CGNAT or double NAT, you’ll need either a static public IP on the WAN side or a reliable port-forwarding and NAT-punching setup at the remote end, sometimes implemented with a VPN-friendly DNS or fixed IP service.

VPN design: IPsec site-to-site on EdgeRouter X

EdgeRouter X does a great job with IPsec site-to-site, and most setups look like this: Microsoft edge vpn kostenlos

Phase 1 IKE with a sensible lifetime for example 28800 seconds and encryption AES-256 plus a modern hash SHA-256.
Phase 2 IPsec with AES-256, SHA-256, Perfect Forward Secrecy PFS with a strong group e.g., 14 or 21.
One tunnel or two, depending on redundancy needs and routing complexity.
Local and remote subnets clearly defined to keep traffic flowing in the right direction.

If you’re deciding between CLI or GUI for configuration:

CLI is precise and repeatable. it’s a favorite for scripted deployments or if you’re comfortable with commands.
GUI EdgeOS is friendlier for quick setups and visualizing traffic flows, but you’ll still want to know the underlying concepts to avoid misconfigurations.

Step-by-step configuration: CLI approach copy-paste-ready pattern

Note: Replace placeholders with your real IPs and subnets.

Update firmware optional but recommended
- sudo add-apt-repository ppa:ubuntugis/ppa
- sudo apt-get update
- sudo apt-get upgrade
Define IKE and ESP groups
- set vpn ipsec ike-group IKE-GROUP0 proposal 1 encryption aes256
- set vpn ipsec ike-group IKE-GROUP0 proposal 1 hash sha256
- set vpn ipsec ike-group IKE-GROUP0 proposal 1 dh-group 14
- set vpn ipsec esp-group ESP-GROUP0 proposal 1 encryption aes256
- set vpn ipsec esp-group ESP-GROUP0 proposal 1 hash sha256
Configure the peer remote device Edge client vpn explained: the ultimate guide to Edge client VPN setup, security, performance, and use cases
- set vpn ipsec site-to-site peer x.x.x.x authentication mode pre-shared-secret
- set vpn ipsec site-to-site peer x.x.x.x authentication pre-shared-secret ‘yourPSK’
- set vpn ipsec site-to-site peer x.x.x.x ike-group IKE-GROUP0
- set vpn ipsec site-to-site peer x.x.x.x default-profile ‘default’
- set vpn ipsec site-to-site peer x.x.x.x local-address 203.0.113.1
- set vpn ipsec site-to-site peer x.x.x.x tunnel 1 local-prefix 192.168.1.0/24
- set vpn ipsec site-to-site peer x.x.x.x tunnel 1 remote-prefix 192.168.2.0/24
Enable and apply the tunnel
- commit
- save
Firewall and NAT adjustments
- set firewall name VPN-INPUT default-action accept
- set firewall name VPN-INPUT rule 10 action accept
- set firewall name VPN-INPUT rule 10 description ‘Allow ISAKMP and IPsec ESP’
- set firewall name VPN-INPUT rule 10 protocol 50
- set firewall name VPN-INPUT rule 10 protocol 50 action accept
- set service nat rule 5010 type destination
- set service nat rule 5010 destination address 192.168.2.0/24
- set service nat rule 5010 inside-interface eth0
- set service nat rule 5010 translate address masquerade
Route configuration if needed
- set protocols static route 192.168.2.0/24 next-hop 192.168.1.1
- Adjust as needed for your topology and routing

Notes:

The exact commands may vary slightly depending on EdgeOS version and your device’s current config. If you’re more comfortable with GUI, these steps translate well into EdgeOS’s VPN → IPsec → Add Peer flow, where you’ll fill in similar fields.

Step-by-step configuration: GUI approach EdgeOS

Access the EdgeRouter X web UI https://, log in.
Go to VPN -> IPsec -> Add Peer
- Build a peer with:
  - Remote IP: the public IP of the remote gateway
  - Local IP: your local public IP auto-filled if detected
  - Authentication: Pre-Shared Key PSK
  - IKE Version: IKEv2 preferred. fallback to IKEv1 if needed
  - IKE Group: 14 or your chosen group
  - Lifetime: 28800 seconds or as preferred
  - PSK: your secret
- Tunnels: Add Tunnel 1
  - Local Subnet: 192.168.1.0/24
  - Remote Subnet: 192.168.2.0/24
In the same interface, set Phase 2 IPsec proposals:
- Encryption: AES-256
- Hash: SHA-256
- PFS: group14 or your chosen PFS group
- Lifetime: 3600 seconds
Firewall rules:
- Ensure UDP ports 500 and 4500, and ESP protocol 50 are allowed on the WAN face.
- Add or adjust a VPN-INPUT firewall rule to permit VPN traffic if needed.
Apply and test:
- Use the EdgeRouter’s built-in diagnostic tools Ping, Traceroute to verify connectivity to a host on the remote network.
- If things fail, verify PSK matches on both ends, make sure the remote peer IP is reachable, and check for overlaps in subnets.

Common pitfalls and how to avoid them

Subnet overlap: Don’t reuse the same LAN subnet on both sides. If you must, rework to a non-overlapping subnet or use a different addressing plan for one end.
Dynamic IP at one end: If the remote site uses a dynamic IP, set up a Dynamic DNS entry and configure the EdgeRouter to track it. Some vendors offer dynamic VPN features that help with constantly changing public addresses.
Mismatched IKE/ESP proposals: Ensure both ends agree on encryption AES-256, hashing SHA-256, and PFS groups. A mismatch is a common reason a tunnel won’t come up.
NAT traversal: If you’re behind NAT, enable NAT-T NAT Traversal so the tunnel can establish through NAT devices. Most modern devices enable this by default, but it’s worth double-checking.
Firewall blocks: The VPN’s ESP protocol 50 and UDP ports 500/4500 must be allowed through both ends’ firewalls. If a firewall blocks these, nothing gets through.
Remote reachability: Ensure you can ping the remote gateway from your EdgeRouter X. If not, address routing or ISP-level blocks before chasing the VPN config.

Testing, validation, and ongoing monitoring

Basic connectivity test: Ping a host on the remote subnet e.g., 192.168.2.10. If you get a response, the tunnel is likely up. if not, re-check IP routes, firewall, and tunnel status.
Tunnel status: Check the EdgeRouter X VPN status page GUI or run the appropriate show vpn commands CLI to confirm the tunnel is established and the data plane is passing traffic.
Traceroute: Do a traceroute to a remote device to confirm route hops and ensure traffic isn’t taking a detour due to a misconfigured route.
Bandwidth and latency: Expect some overhead due to encryption. For small to medium sites, AES-256 with SHA-256 won’t typically saturate a 100 Mbps link, but verify your real-world performance.
Redundancy: If you configured a second tunnel for redundancy, test failover by simulating a WAN outage disconnect the primary link to see if traffic properly shifts to the backup tunnel.

Tips for reliability: Change vpn edge

Enable Dead Peer Detection DPD to detect dead peers more quickly and re-establish tunnels automatically when needed.
Schedule periodic health checks or use a monitoring tool to alert you on VPN status changes, latency spikes, or tunnel drops.
Document every change you make with timestamped notes so you can rollback or adjust confidently.

Security considerations and best practices

Use a strong PSK or, better yet, certificate-based authentication if supported by your remote site. Certificates reduce the risk of PSK leakage and misconfiguration.
Keep EdgeRouter X firmware up to date to mitigate known IPsec vulnerabilities and performance issues.
Segment VPN traffic with precise local and remote subnets to minimize exposure and keep your internal network protected if the VPN endpoints are compromised.
Consider inbound access rules. Don’t expose internal resources directly to the internet. ensure the VPN is the only path to sensitive resources when appropriate.
Regularly review and rotate PSKs or certificates on a sensible schedule to reduce risk if credentials are ever exposed.

Advanced tips: performance, reliability, and scale

MTU considerations: If you notice packet fragmentation or latency issues, adjust MTU settings or enable Path MTU Discovery on both ends so VPN packets aren’t dropped due to mismatched MTU.
Split tunneling vs full tunnel: For many setups, route only the remote subnet over the VPN split tunnel. If all traffic should be tunneled, configure a full-tunnel approach and ensure appropriate routing rules.
Multi-site designs: If you’re connecting more than two sites, you can emulate hub-and-spoke or full mesh by defining multiple site-to-site peers, but plan your network tree carefully to avoid route loops.
Logging and forensics: Enable VPN logs and keep them for a defined period. They’re invaluable if you need to trace a tunnel issue or verify compliance after an incident.
Redundancy strategies: If uptime is critical, consider a second EdgeRouter X as a backup or a second ISP path on the primary router with a failover VPN design.

Troubleshooting quick-reference

Tunnel not coming up: double-check PSK, IPs, and the exact remote peer’s address. Ensure the endpoints can reach each other on the public internet.
Phase 1 established but Phase 2 not: re-check encryption and hash choices. confirm local/remote subnets don’t overlap. check NAT settings.
Traffic not routing through VPN: confirm static routes exist pointing to the remote subnet, and that firewall rules allow VPN traffic.
Remote site unreachable after setup: verify that the remote network isn’t using conflicting or overlapping routes. check for double NAT issues and firewall blocks.
Intermittent drops: review Dead Peer Detection, rekey settings, and consider adjusting lifetimes. A longer lifetime can reduce rekey overhead but might be less responsive to changes.

Frequently Asked Questions

Why would I use a site-to-site VPN instead of a client VPN for remote access?

Site-to-site VPNs connect entire networks, so devices on both ends can talk as if they’re on the same LAN, without requiring users to connect with a VPN client. Client VPNs are great for individual users, while site-to-site is ideal for office-to-office or branch-to-headquarters connections.

Can EdgeRouter X handle IPsec site-to-site VPNs?

Yes. The EdgeRouter X supports IPsec-based site-to-site VPNs using EdgeOS and strongSwan, making it a solid option for linking two networks securely.

Which VPN protocols are supported by EdgeRouter X for site-to-site?

IPsec is the recommended and most widely supported option for site-to-site VPNs on EdgeRouter X. OpenVPN is less common for this device in practice, and IPsec generally offers better performance on EdgeOS hardware.

Do I need a static public IP on both ends?

A static IP on at least one end makes management easier, but you can work with dynamic IPs if you set up Dynamic DNS on both sides and configure the peers accordingly. The remote end needs to be reachable by the other side at all times.

What’s better: PSK or certificates for IPsec?

Certificates are more secure and scalable for larger deployments, but PSKs are simple and perfectly adequate for small sites with careful management. If you can manage certificate infrastructure, it’s worth it. Browser vpn edge: how to use Edge browser VPN extensions for secure, private browsing, performance tips, and setup guide

How do I test the VPN after configuration?

Ping devices on the remote subnet, run traceroutes, and verify that traffic to remote IPs traverses the tunnel. Use the EdgeRouter’s VPN status page or CLI to confirm tunnel status and data throughput.

What if the tunnel drops after a few hours?

Possible causes include IKE rekey failures, unstable WAN, or NAT-T issues. Check hardware stability, ensure DPD is enabled, verify rekey lifetimes, and confirm both ends support the chosen IKE/ESP lifetimes.

Can I have more than one site-to-site VPN on EdgeRouter X?

Yes. You can configure multiple IPsec site-to-site peers, but plan your IP addressing, routing, and firewall rules carefully to prevent conflicts.

How do I handle a remote site with a different subnet size or a larger network?

Define precise local and remote prefixes in the tunnel configuration and ensure routing rules on both sides match the intended traffic. Fine-tune the split of network ranges to optimize routing.

Should I use NAT on the VPN tunnel?

Typically, you don’t NAT traffic between the two VPN subnets. you should translate internal addresses only where necessary for outbound internet traffic. Ensure NAT is not messing with VPN traffic or overlapping networks. Browsec vpn microsoft edge

How do I monitor VPN health over time?

Keep an eye on tunnel uptime, rekey events, latency, and throughput. Set up alerting through your network monitoring tool or the EdgeRouter’s built-in logs to get notified of tunnel drops or performance issues.

Can I add a second VPN path for redundancy?

Yes, you can configure a second IPsec tunnel with a different remote peer to provide redundancy. Make sure routing and firewall rules are designed so that traffic can failover gracefully if one tunnel goes down.

Is EdgeRouter X suitable for busy offices or large remote sites?

EdgeRouter X is a great value for small offices and light-to-moderate remote sites. For very high traffic or multiple simultaneous tunnels, you might consider higher-end EdgeRouter models with more CPU and RAM to keep performance steady.

What are best practices for naming and documenting VPN peers?

Use consistent, descriptive names for each peer e.g., SiteA_to_SiteB_IPsec and keep a shared document with the PSK/cert details, local/remote subnets, lifetimes, and any dynamic DNS entries. This helps future admins manage the VPN without guesswork.

Final notes

Setting up a site-to-site VPN on the Ubiquiti EdgeRouter X is absolutely doable with careful planning, clear subnet boundaries, and a methodical configuration approach. Whether you stick with a CLI manifest or a GUI-based flow, the core ideas stay the same: authentication, encryption, traffic routing, and robust testing. With the right setup, you’ll have a private, reliable bridge between sites, enabling seamless resource sharing and improved collaboration across locations. Windscribe edge guide to secure browsing, Windscribe Edge features, setup, and comparison

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