Edgerouter x vpn site to site: how to set up secure IPsec connections on EdgeRouter X for site-to-site VPNs

Yes, you can set up a site-to-site VPN on EdgeRouter X. This guide walks you through why EdgeRouter X is a solid choice for small offices or home labs, what a site-to-site VPN entails, and how to configure IPsec between two EdgeRouter X devices or between EdgeRouter X and another IPsec-capable endpoint. You’ll get practical, step-by-step instructions, tips to avoid common pitfalls, and real-world scenarios you can adapt to your network. If you’re just testing concepts or want a simple lab setup, there’s a quick section to help you validate the tunnel quickly. And for those who want a consumer VPN option for clients or extra lab safety, I’ve included a quick mention of a popular service with a value-oriented deal you can explore during testing. NordVPN 77% OFF + 3 Months Free

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Useful resources you might check out text only: EdgeRouter official docs help.ubiquiti.com, EdgeOS CLI reference, VyOS/IPsec basics, strongSwan documentation, and general VPN best practices guides.

Introduction: what you’ll learn in this guide short, practical overview

• Yes, you can set up a site-to-site VPN on EdgeRouter X.
• This guide covers design choices hub-and-spoke vs full mesh, prerequisites, credential options PSK vs certificate, and a practical, step-by-step configuration workflow for IPsec site-to-site.
• You’ll see GUI-based steps for common scenarios and a concise CLI snippet you can adapt.
• I’ll cover firewall rules, routing adjustments, NAT considerations, and how to test and validate the tunnel.
• Finally, I’ll share best-practice tips on security, performance, and troubleshooting so you don’t twist in the wind when things don’t come up on the first try.
• Useful resources and a quick lab validation checklist are included at the end of the intro.

Body

Why EdgeRouter X is a solid choice for site-to-site VPNs

EdgeRouter X sits in the budget-friendly tier of Ubiquiti’s EdgeRouter line, but it’s capable enough for small offices and home labs that need reliable IPsec site-to-site VPNs. Here are a few reasons it’s popular for site-to-site deployments:

• CPU and throughput balance: EdgeRouter X is designed to handle multiple WAN connections and basic VPN tasks without breaking the bank. With sensible configurations AES-128/256, SHA-1/SHA-256, DH groups, you’ll get solid performance for typical remote sites and branch offices.
• Flexibility: You can configure IPsec site-to-site peers, subnets, and firewalls via both the GUI and CLI. This dual-path setup is handy if you’re prototyping and then migrating to a more complex topology.
• Harmony with other devices: The EdgeRouter X plays nicely with other EdgeRouters in hub-and-spoke or mesh-like topologies and can interoperate with other IPsec devices, including commercial firewall appliances and cloud VPN endpoints.

That said, there are some caveats to keep in mind:

• Hardware limits: Expect VPN throughput to be lower than high-end routers, especially with strong encryption. For most small sites, that’s fine, but plan bandwidth with headroom for encrypted traffic.
• VPN features support: EdgeRouter X focuses on solid IPsec functionality. if you want cutting-edge features like native WireGuard on the device itself, you may need to run a router OS that includes it or use a separate device for VPN termination.

VPN basics: site-to-site vs remote access and the design you’ll use

• Site-to-site VPN S2S connects two or more sites at the network level, creating a secure tunnel between local networks LANs. Devices behind each EdgeRouter X can reach devices across the tunnel as if they were on the same LAN, provided you set up the correct subnets and routing.
• Hub-and-spoke design is common for two sites or a small number of sites. One central site hub routes traffic to and from other sites spokes. This reduces complexity when you have multiple branches.
• Full mesh is more scalable for many sites, but it adds configuration overhead. For EdgeRouter X in a small office environment, hub-and-spoke is often the simplest starting point.

Key parameters you’ll configure:

• Local subnet the LAN behind the EdgeRouter X
• Remote subnet the LAN behind the other VPN peer
• Remote peer IP address public IP of the other site
• Authentication method shared pre-shared key or certificates
• IKE Phase 1 and ESP Phase 2 proposals encryption, hashing, PFS
• NAT traversal NAT-T if you’re behind NAT on either side

Prerequisites and design considerations

Before you start, gather these details:

• Public IPs of both VPN peers or dynamic DNS if you don’t have a static IP
• Local subnets for each site e.g., 192.168.1.0/24 on Site A, 192.168.2.0/24 on Site B
• A pre-shared key PSK or a certificate setup if you’re going with PKI
• Any firewall rules you’ll need to allow VPN traffic ESP, ISAKMP, UDP 500/4500 typically
• A plan for the tunnel to reach the remote subnets and how routes will be advertised

Optional but helpful data: Unifi edge router vpn

• Average VPN throughput you expect per site under AES-256 and SHA-256
• Whether you’ll route only specific subnets through the tunnel or all traffic split tunneling versus full tunnel
• Whether you’ll use dynamic DNS on either side to account for changing public IPs

Data point: VPN adoption and remote-work trends show a continued push toward site-to-site VPNs for small to mid-sized businesses, particularly when consolidating remote locations. While cloud-based connectivity grows, IPsec remains a dependable, on-prem solution for predictable performance and control.

IPsec site-to-site: PSK vs certificate-based authentication

• Pre-shared key PSK: Simple to set up and ideal for a small number of sites. The PSK is shared between peers and must be kept secure. It’s easier to manage for two sites but can be a single point of compromise if not rotated regularly.
• Certificate-based PKI: More scalable for larger deployments and provides better control with mutual authentication. It requires a PKI setup CA, certificates and a revocation plan. It’s more complex but can be worth it as you grow.

IKE phase 1 choices:

• IKEv2 is generally recommended for stability and performance on modern devices. If you’re sticking with older EdgeOS versions or have compatibility constraints, IKEv1 with main mode is an alternative.

ESP phase 2 choices:

• AES-256 with SHA-256 is a strong, widely supported option. You can opt for AES-128 if you need to squeeze out extra performance, but it’s usually fine to stick with AES-256 for security.

Perfect Forward Secrecy PFS:

• PFS groups like 14, 19, or higher improve security by ensuring that session keys are not derived from a static key. For small sites, Group 14 2048-bit or Group 19 256-bit ECC is common. If you’re chasing performance, you could use a smaller group, but be mindful of the security trade-offs.

NAT-T: Cyberghost vpn edge extension

• If either site sits behind NAT, enable NAT Traversal so IPsec can negotiate connections through NAT devices.

Step-by-step: configuring IPsec site-to-site VPN on EdgeRouter X GUI

Here’s a practical path you can follow using the EdgeOS GUI. You’ll repeat a similar flow on the other site.

1. Prepare your design

• Confirm local LAN addresses Site A: 192.168.1.0/24 and remote LAN Site B: 192.168.2.0/24
• Determine remote peer public IP e.g., 203.0.113.1
• Decide on PSK or PKI for this walkthrough, we’ll use PSK

2. Create the IPsec peer

• Log in to EdgeRouter X web UI
• Go to VPN > IPsec
• Add a new peer:
  • Remote IP: 203.0.113.1
  • Local subnet: 192.168.1.0/24
  • Remote subnet: 192.168.2.0/24
  • Authentication: Pre-shared key
  • PSK: yourStrongPresharedKey
  • Enable NAT-T if you’re behind NAT

3. Set IKE and ESP proposals

• IKE-group: set to IKEv2 with AES-256 and SHA-256
• ESP-group: AES-256 with SHA-256
• Enable PFS with a DID group e.g., 14

4. Create firewall rules to allow VPN traffic

• Allow UDP 500 and UDP 4500 on the WAN interface
• Allow ESP protocol 50 if your firewall policy requires explicit rules

5. Add static routes

• Route traffic destined for 192.168.2.0/24 via the VPN tunnel interface
• Ensure the other site knows how to reach 192.168.1.0/24

6. Save, test, and monitor

• Save the configuration
• Initiate the tunnel and check the Status page or the CLI for “IPsec SA established”
• Ping a device on the remote LAN to verify connectivity

7. Validate traffic

• Check with traceroute to identify where traffic is flowing
• Verify MTU compatibility if you notice fragmentation issues

Note: If your EdgeRouter X is in a more complex topology multiple subnets, more than two sites, you’ll scale the IPsec config accordingly and may want to implement a dynamic routing protocol e.g., OSPF between sites for automatic route propagation.

Step-by-step: configuring IPsec site-to-site VPN on EdgeRouter X CLI

If you prefer the command line or are scripting deployments, here’s a CLI-style outline you can adapt. Replace placeholders with your actual values.

• Enable IPsec interfaces and choose the interface that faces the internet on both devices:

  • set vpn ipsec interfaces interface eth0

• Define the IPsec IKE group IKEv2, AES256, SHA256, DH group 14 Windows 10 vpn free: comprehensive guide to free and paid VPN options, setup, privacy, and speed

  • set vpn ipsec ike-group IKEv2-AES256-SHA256 lifetime 86400
  • set vpn ipsec ike-group IKEv2-AES256-SHA256 proposal 1 encryption aes256
  • set vpn ipsec ike-group IKEv2-AES256-SHA256 proposal 1 hash sha256
  • set vpn ipsec ike-group IKEv2-AES256-SHA256 proposal 1 dh-group 14

• Define the ESP Phase 2 group

  • set vpn ipsec esp-group ESP-AES256-SHA256 proposal 1 encryption aes256
  • set vpn ipsec esp-group ESP-AES256-SHA256 proposal 1 hash sha256

• Create the IPsec site-to-site peer use the actual remote IP and change local/remote subnets

  • set vpn ipsec site-to-site peer 203.0.113.1 authentication mode pre-shared-secret
  • set vpn ipsec site-to-site peer 203.0.113.1 authentication pre-shared-secret ‘your-psk’
  • set vpn ipsec site-to-site peer 203.0.113.1 ike-group IKEv2-AES256-SHA256
  • set vpn ipsec site-to-site peer 203.0.113.1 default-esp-group ESP-AES256-SHA256
  • set vpn ipsec site-to-site peer 203.0.113.1 local-subnet 192.168.1.0/24
  • set vpn ipsec site-to-site peer 203.0.113.1 remote-subnet 192.168.2.0/24
  • set vpn ipsec site-to-site peer 203.0.113.1 tunnel 1 allow-nat-traversal

• Commit and save

  • commit
  • save

• Test from the CLI

  • show vpn ipsec sa
  • show log
  • ping 192.168.2.10 source 192.168.1.10

Pro tips for CLI users: Mullvad vpn extension

• Keep PSKs strong and rotate them periodically.
• If you’re testing, you can temporarily reduce encryption to AES-128 to see if performance improves, then revert to AES-256 for production.
• If you’re behind NAT, ensure NAT-T is enabled and that you have proper firewall rules to allow the VPN traffic.

Common pitfalls and troubleshooting tips

• Mismatched subnets: The local and remote subnet definitions must align on both sides. A mismatch will prevent traffic from flowing even if the tunnel is established.
• Authentication mismatch: If PSK or certificate mismatches occur, the tunnel won’t establish. Double-check that both sides use the same PSK, or that PKI certificates are properly issued and installed.
• Firewall gaps: Don’t forget to allow the necessary IPsec-related ports and protocols on both sides. ESP is IP protocol 50. ISAKMP IKE is UDP 500. NAT-T often uses UDP 4500.
• NAT and double NAT: If you’re in a double NAT environment, ensure NAT-T is enabled and that the tunnel endpoints can reach each other’s public IPs.
• Routing issues: After the tunnel comes up, you may still need to add static routes or adjust dynamic routing so that traffic intended for the remote subnet actually goes through the VPN.

Security considerations and hardening tips

• Use strong PSKs or certificates. For PSKs, aim for at least 16–24+ characters with a mix of random letters, numbers, and symbols.
• Prefer IKEv2 with AES-256 and SHA-256 for best balance of security and performance.
• Enable PFS for the ESP phase 2 and select a reasonable DH group 14 or higher unless you have a compelling reason to choose otherwise.
• Regularly audit firewall rules to ensure VPN traffic is allowed only where you want it. Limit access so only the necessary remote subnets can reach your internal network.
• Monitor VPN health on both sides: watch for tunnel uptime, phase 1/2-negotiation failures, and any unexpected changes in traffic patterns.
• Consider certificate-based authentication if you manage multiple sites. It scales better and supports revocation lists CRLs or OCSP for quick trust updates.

Real-world considerations: performance and maintenance

• Expect VPN performance to be bounded by the EdgeRouter X’s CPU and memory. AES-256 encryption adds overhead. if you notice VPN throughput is falling short of your needs, you can:
  • Downgrade encryption to AES-128 while still maintaining strong security
  • Optimize firewall rules to reduce processing load
  • Keep firmware up to date to benefit from performance and stability fixes
• If you’re growing beyond two sites, plan for a scalable design: a dedicated site-to-site hub with reliable connectivity, and consider migrating from PSK to a PKI setup for easier certificate management.

Comparison: IPsec vs other options for site-to-site VPNs

• IPsec remains the stalwart for site-to-site VPNs—well-supported, interoperable across many devices, and robust in most network environments.
• WireGuard is gaining popularity for client VPNs due to performance and simplicity, but enterprise site-to-site support on legacy EdgeRouter X devices may be limited without additional tooling.
• OpenVPN is still a solid choice in many environments, especially when you need fine-grained control and compatibility with older devices, but it can be heavier on CPU than IPsec in some configurations.
• For EdgeRouter X, IPsec is the most straightforward, well-supported method to establish site-to-site connectivity with predictable behavior across various devices.

Quick validation checklist lab/quick test

• Verify tunnel status is “active” or “established” on both sides.
• Ping cross-site devices e.g., ping 192.168.2.10 from 192.168.1.10.
• Validate routing: ensure routes point to the remote subnets via the VPN tunnel.
• Confirm firewall rules are allowing traffic across the VPN and in the desired direction.
• Check logs for ISAKMP/IKE/ESP negotiation messages to identify any misconfigurations quickly.

Frequently Asked Questions

Frequently Asked Questions

What is Edgerouter X and what makes it good for a site-to-site VPN?

EdgeRouter X is a budget-friendly router from Ubiquiti that supports IPsec site-to-site VPNs and EdgeOS. It’s well-suited for small offices or home lab setups where you need reliable VPN capability without blowing your budget. Its GUI and CLI options give you flexibility to prototype quickly and then lock in a stable configuration for production use.

Do I need a static IP on both sites to run IPsec site-to-site?

Static IPs simplify remote access because each peer knows exactly where to reach the other. If you have dynamic IPs, you can use dynamic DNS services and a stable remote hostname. However, dynamic IPs require additional monitoring and update mechanisms to keep the VPN peer definitions accurate.

Which authentication method should I pick, PSK or certificates?

For two sites or a small number of peers, PSK is simplest to implement. If you’re growing to more sites or want stronger scalability and revocation features, certificates PKI are the better long-term choice. PSK is easier to manage in a quick lab, while PKI scales better for larger networks.

Should I use IKEv2 or IKEv1 on EdgeRouter X?

IKEv2 is recommended for modern devices because it’s faster, more stable, and easier to configure in most cases. If you have an older EdgeOS version or compatibility issues with a remote device, IKEv1 is still an option, but you’ll benefit from upgrading if possible. Express vpn extension opera: how to set up and maximize privacy with Opera browser

How do I decide on an encryption and hash algorithm?

AES-256 with SHA-256 is a strong, widely supported choice. It balances security and performance well for most sites. If you’re chasing higher throughput in a constrained device, you can test AES-128 and SHA-256, but ensure you maintain an acceptable level of security.

Can I have more than two sites in a single VPN topology with EdgeRouter X?

Yes, you can design hub-and-spoke or full-mesh topologies, but it increases configuration complexity. Start with two sites to validate the setup, then add additional tunnels gradually and rework firewall rules and routing as needed.

How do I test the VPN after configuration?

Use the EdgeRouter X status page or CLI to verify that the IPsec SA is established. Run pings between remote subnets, use traceroute to verify path correctness, and confirm that traffic traverses the VPN tunnel as intended. Check logs for negotiation messages if things don’t work.

What firewall rules should I consider for a site-to-site VPN?

Typically, you’ll need:

• Allow UDP 500 ISAKMP and UDP 4500 NAT-T on the WAN interface
• Allow ESP protocol 50 if required by your policy
• Allow traffic from the local subnet to the remote subnet and vice versa through the VPN interface

What performance considerations should I plan for?

Expect VPN throughput to be limited by CPU and encryption. If you’re hitting a ceiling, consider adjusting encryption AES-128 instead of AES-256 for throughput, if security requirements permit or upgrading to a more capable router. For small sites, EdgeRouter X often provides reasonable performance with proper tuning. What is hotspot vpn and how it protects your mobile hotspot, setup guides, top providers, tricks, and security tips

How often should I rotate my PSK or manage certificates?

If you’re using PSK, rotate it on a schedule e.g., every 6–12 months, or when you suspect it may be compromised. With PKI, manage certificates via your CA policies, revoke compromised certs, and issue new certificates as needed. Regular rotation and revocation are part of a good security hygiene.

How can I expand this with more sites later?

Plan for a hub-and-spoke or mesh topology, maintain consistent IKE/ESP parameter sets across peers, and start with a simple two-site test. When you add sites, you’ll adjust firewall policies, static routes, and, if necessary, routing protocol configurations to propagate the new network paths.

Additional notes and resources text-only

• EdgeRouter X and EdgeOS documentation: help.ubiquiti.com
• EdgeOS CLI reference and sample configurations
• strongSwan documentation for IPsec concepts and advanced configurations
• General VPN best practices for small and medium networks
• Community forums and troubleshooting threads for EdgeRouter X users

This guide aims to give you a clear, practical path to building a reliable IPsec site-to-site VPN with EdgeRouter X. You now have a tried-and-true workflow you can adapt, test, and scale as your network grows. If you’re starting from scratch, begin with a two-site hub-and-spoke design, ensure your PSK or certificate setup is rock-solid, and validate every step with real traffic to confirm stability before adding more tunnels or subnets.

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