Edgerouter x vpn site to site: comprehensive setup guide for EdgeRouter X site-to-site VPN with IPsec, multi-site options, routing, firewall rules, troubleshooting, and best practices

Yes, you can set up Edgerouter X for a VPN site-to-site connection. In this guide I’ll walk you through everything you need to know to get a robust, scalable IPsec site-to-site tunnel between two EdgeRouter X devices or between an EdgeRouter X and another vendor’s router. This is a practical, real-world walkthrough designed for people who want to get a reliable, routable tunnel without unnecessary complexity.

Pro tip: for extra privacy during testing or when you’re juggling remote sites, NordVPN can be a handy safety net for client-side testing or for securing remote access during lab work.

What you’ll get in this guide:

• A clear, step-by-step plan to design your site-to-site VPN, including IP addressing, tunnels, and routing
• Concrete EdgeRouter X commands and configuration examples you can adapt
• Real-world tips for firewall rules, NAT, IKE/IPsec parameters, and tunnel health checks
• How to test, verify, and troubleshoot common issues
• Security best practices and performance considerations for EdgeRouter X

Useful URLs and Resources un clickable text, to reference as you study:

• EdgeRouter X official documentation – help.ui.com
• EdgeOS configuration guide – help.ui.com/hc/en-us/articles
• IPsec concepts for VPNs – en.wikipedia.org/wiki/Virtual_private_network
• StrongSwan IPsec manual – wiki.strongswan.org
• DynDNS and dynamic IP solutions – no-ip.com or dyndns.org
• Native EdgeRouter X feature list – ubnt.com
• Network subnet planning basics – subnetcalc.org
• Basic firewall concepts for routers – cisco.com
• Small business VPN best practices – techradar.com
• Open source VPN comparison guides – arstechnica.com

Introduction: what this guide covers and how it helps you

• The first thing you’ll want to know: Edgerouter X can do site-to-site VPN using IPsec with other routers or appliances that speak IPsec.
• I’ll break down the planning phase, show you exact configuration steps for both sides of the tunnel, and walk you through validation and troubleshooting.
• You’ll learn how to pick IPsec/IKE groups, ESP proposals, and how to map subnets so traffic between sites routes correctly.
• I’ll also cover firewall and NAT considerations so VPN traffic doesn’t get dropped, plus practical performance tips for EdgeRouter X.
• Finally, you’ll get a checklist you can reuse for multi-site deployments and for renewing VPN tunnels without downtime.

Body

EdgeRouter X and site-to-site VPN basics

EdgeRouter X is a cost-effective, router-grade device from Ubiquiti that runs EdgeOS. For site-to-site VPNs, the common approach is IPsec IKEv1 or IKEv2 to create a secure tunnel between two networks over the internet. A few key concepts to keep in mind:

• Site-to-site VPN creates a tunnel between two networks, not between users. It’s ideal for connecting branch offices, data centers, or remote sites.
• IPsec uses two main phases: phase 1 IKE sets up a secure channel auth, encryption, and identity, and phase 2 IPsec protects the actual data traffic tunnels, subnets, and NAT handling.
• You’ll specify local and remote subnets, a pre-shared key PSK or certificates, encryption algorithms AES, ChaCha20, hash algorithms SHA-256, and DH groups e.g., 14 for 2048-bit DH.
• NAT traversal NAT-T is commonly used if either endpoint sits behind a NAT. Both sides should agree on the same IPsec lifetimes and rekey settings.
• Firewall rules are essential. VPN traffic must be allowed through the WAN interface, and there should be firewall rules permitting traffic from the local VPN to the remote subnet.

This guide uses practical, copy-ready examples you can adapt. If you’re new to IPsec, think of it as two layers: a tunnel-creation layer and a routing layer. The tunnel ensures privacy and integrity, while routing tells the devices where to send traffic destined for the other side.

Prerequisites and planning

Before you touch the CLI, do a quick plan:

• Subnet design: Pick distinct private subnets for each site that do not overlap. Example: Site A uses 192.168.1.0/24, Site B uses 192.168.2.0/24.
• Public IPs: Note the public IP address for each EdgeRouter X. If dynamic, you’ll want a dynamic DNS setup on each side.
• PSK vs certificates: For most small-to-medium deployments, a strong pre-shared key is fine. Certificates add complexity but are more scalable in larger environments.
• IP routing: Decide if you’ll use static routes or run a dynamic routing protocol OSPF is common in larger networks across VPNs. EdgeRouter X supports static routes easily. dynamic routing requires more careful planning and compatibility between sites.
• Performance expectations: EdgeRouter X is a budget device. Expect VPN throughput to be lower than pure routing throughput. Plan accordingly if you’re running business-critical traffic.

Step-by-step: configure site A EdgeRouter X for a site-to-site IPsec VPN

Note: Replace placeholders with your actual addresses. This example uses Site A local subnet 192.168.1.0/24 and Site B remote subnet 192.168.2.0/24. Public IP for Site A is yoursiteA.example.com or a real IP, Site B is remote IP 203.0.113.10, PSK is yourStrongP@ssw0rd.

1. Planning the IPsec/IKE groups and ESP group

• IKE Phase 1 group: choose a strong config, for example:
  • Encryption: aes256
  • Hash: sha256
  • DH group: 14 2048-bit
  • Lifetime: 3600 seconds
• IPsec Phase 2 ESP group:

2. Configure the IKE and ESP groups EdgeRouter X CLI style

• set vpn ipsec ike-group IKE-GROUP-1 lifetime 3600
• set vpn ipsec ike-group IKE-GROUP-1 proposal 1 encryption aes256
• set vpn ipsec ike-group IKE-GROUP-1 proposal 1 hash sha256
• set vpn ipsec ike-group IKE-GROUP-1 proposal 1 dh-group 14
• set vpn ipsec esp-group ESP-GROUP-1 lifetime 3600
• set vpn ipsec esp-group ESP-GROUP-1 proposal 1 encryption aes256
• set vpn ipsec esp-group ESP-GROUP-1 proposal 1 hash sha256

3. Define the VPN peer and tunnels

• set vpn ipsec site-to-site peer 203.0.113.10 authentication mode pre-shared-secret
• set vpn ipsec site-to-site peer 203.0.113.10 authentication pre-shared-secret ‘yourStrongP@ssw0rd’
• set vpn ipsec site-to-site peer 203.0.113.10 ike-group IKE-GROUP-1
• set vpn ipsec site-to-site peer 203.0.113.10 default-esp-group ESP-GROUP-1
• set vpn ipsec site-to-site peer 203.0.113.10 local-address Site A public IP

4. Local and remote tunnel configuration

• set vpn ipsec site-to-site peer 203.0.113.10 tunnel 1 local prefix 192.168.1.0/24
• set vpn ipsec site-to-site peer 203.0.113.10 tunnel 1 remote prefix 192.168.2.0/24

5. NAT and firewall for VPN traffic

• If you’re using the VPN to connect two private networks, you’ll typically want NAT exemption for VPN traffic:
  • set nat source rule 1000 type exception
  • set nat source rule 1000 destination 192.168.2.0/24
  • set nat source rule 1000 description ‘VPN: Site B’
• Then ensure firewall rules on the WAN allow ESP UDP 500/4500 for IPsec IKE and IPsec ESP or rely on the EdgeRouter’s default firewall if it’s permissive for IPsec.

6. Routing

• Add a static route so traffic destined for 192.168.2.0/24 is sent via the VPN interface
  • set protocols static route 192.168.2.0/24 next-hop 192.168.1.1
  • If you’re using a tunnel interface depending on firmware, route to the tunnel’s internal IP or use a VPN policy route.

7. Commit and save

• commit
• save

8. Verify connectivity from Site A

• ping 192.168.2.1 a host on Site B
• show vpn ipsec sa
• show vpn ipsec status
• show log | match ipsec

That’s the basic site A setup. Now let’s mirror this on Site B. K electric offices

Step-by-step: configure site B the remote EdgeRouter X or another vendor for the same IPsec tunnel

The steps are mirrored. You’ll define the local subnet for Site B, remote site’s subnet Site A, and the same PSK and IKE/ESP parameters.

1. Identify your subnets

• Site B local subnet: 192.168.2.0/24
• Remote subnet Site A: 192.168.1.0/24
• Public IP for Site B: 203.0.113.10

2. Match IKE and ESP groups

• Use the same IKE-GROUP-1 and ESP-GROUP-1 as Site A

3. Configure the tunnel

• set vpn ipsec site-to-site peer 203.0.113.10 local-address 203.0.113.10
• set vpn ipsec site-to-site peer 203.0.113.10 tunnel 1 local prefix 192.168.2.0/24
• set vpn ipsec site-to-site peer 203.0.113.10 tunnel 1 remote prefix 192.168.1.0/24

4. NAT, firewall, and routing on Site B

• Similar NAT exemption for VPN traffic, if needed
• Ensure a static route back to 192.168.1.0/24 via the VPN

5. Commit and verify

• ping 192.168.1.1 from a host on Site B

If both tunnels come up, traffic should flow between 192.168.1.0/24 and 192.168.2.0/24 across the VPN.

Common pitfalls and troubleshooting tips

• Subnet overlap: Even a small overlap makes the tunnel unhappy. Double-check both sides’ local and remote subnets. they must be unique and non-overlapping.
• Mismatched PSK or IKE/ESP settings: Ensure the pre-shared key exactly matches on both sides and that you’re using the same encryption, hash, and DH group.
• NAT-T issues: If either router sits behind NAT, NAT-T must be enabled and the remote peer must be reachable via its public IP.
• Firewall blocking: A common cause of “VPN tunnel up but no traffic” is a firewall ruleset that blocks IPsec traffic or the tunnel’s data plane.
• Dynamic IPs: If your site uses dynamic IPs, you’ll either need a dynamic DNS setup on both sides or a vendor that supports dynamic IP updates. Otherwise, VPN peers won’t find each other when IPs change.
• DNS leakage: If you rely on DNS for remote subnets, ensure DNS settings are correctly configured so that DNS requests from the remote subnet go through the VPN or local resolvers.
• Multi-site scaling: For multiple remote sites, you can add more IPsec peers and tunnels, but keep track of subnets and routing to avoid confusion.

Security best practices and performance tips

• Use strong encryption and hash algorithms AES-256, SHA-256 and a robust DH group.
• Regularly update EdgeRouter X firmware to patch IPsec vulnerabilities and improve performance.
• Disable weak protocols and ensure only IPsec ESP is allowed for site-to-site traffic.
• Consider a separate firewall zone for VPN traffic to limit exposure in case of a breach.
• If throughput is a concern, reduce the number of encryption policies or consider upgrading hardware for heavy traffic EdgeRouter X can handle basic VPN traffic well but has limited throughput under heavy load.
• For dynamic IP sites, use a dynamic DNS service and configure the remote peer to refer to the dynamic DNS hostname if the factory IP changes frequently.
• Monitor VPN health with logs and periodic pings. Use keepalive or DPD Dead Peer Detection to detect a failed tunnel quickly and re-establish it.

Real-world deployment scenarios and advanced tips

• Two-site hub-and-spoke: One hub site connects to multiple spokes. Each spoke has its own IPsec tunnel with separate subnets. a dynamic or static routing approach handles traffic between the hub and spokes.
• Redundancy: If you need higher reliability, you can configure multiple IPsec tunnels to the same remote site behind different public IPs, if available and use routing policies to balance or failover.
• IPv6 considerations: If you’re planning IPv6 site-to-site VPNs, you’ll need dual-stack subnets and ensure IPsec configurations on both sides reflect IPv6 addressing when supported by the router firmware.
• Monitoring and alerting: Integrate your VPN status with network monitoring tools. EdgeRouter X offers logs that can be parsed by SNMP or syslog-based systems to alert you when a tunnel drops.
• Client VPN integration: If you also need client-to-site VPN access, you can run a separate OpenVPN or WireGuard server on a different interface or use a separate device. keep it distinct from your IPsec site-to-site configuration to avoid conflicts.

Troubleshooting checklist quick reference

• Tunnel status: show vpn ipsec sa and show vpn ipsec status
• Connectivity: ping remote-side hosts across VPN tunnel
• Subnets: verify local and remote prefixes match on both sides
• PSK: re-check pre-shared key on both peers
• NAT: ensure NAT exemptions correctly cover VPN traffic
• Firewall: verify inbound/outbound rules permit IPsec and VPN traffic
• Logs: review EdgeOS logs for IPsec negotiation errors or tunnel rekey events
• IR: confirm both sides’ clocks are roughly synchronized to avoid IPsec SA lifetime mismatches

Performance considerations

• CPU overhead: IPsec encryption runs on the router CPU. EdgeRouter X’s CPU can be a bottleneck if you push heavy traffic, especially with AES-256 and SHA-256.
• Latency: VPN adds some latency. plan for it in your SLA or network design.
• MTU adjustments: If you see fragmentation or packet drops, you might need to tune MTU and MSS to account for VPN overhead.
• Offloading: Some versions offer limited hardware acceleration. verify what your firmware supports and tune accordingly.

Quick reference: sample configuration blocks you can adapt

Note: The exact command syntax may differ slightly based on EdgeOS version. Use these as templates and align with your firmware.

• IKE and ESP groups

  • set vpn ipsec ike-group IKE-GROUP-1 lifetime 3600
  • set vpn ipsec ike-group IKE-GROUP-1 proposal 1 encryption aes256
  • set vpn ipsec ike-group IKE-GROUP-1 proposal 1 hash sha256
  • set vpn ipsec ike-group IKE-GROUP-1 proposal 1 dh-group 14
  • set vpn ipsec esp-group ESP-GROUP-1 lifetime 3600
  • set vpn ipsec esp-group ESP-GROUP-1 proposal 1 encryption aes256
  • set vpn ipsec esp-group ESP-GROUP-1 proposal 1 hash sha256

• Site-to-site peer How to turn on vpn on microsoft edge

  • set vpn ipsec site-to-site peer 203.0.113.10 authentication mode pre-shared-secret
  • set vpn ipsec site-to-site peer 203.0.113.10 authentication pre-shared-secret ‘yourStrongP@ssw0rd’
  • set vpn ipsec site-to-site peer 203.0.113.10 ike-group IKE-GROUP-1
  • set vpn ipsec site-to-site peer 203.0.113.10 default-esp-group ESP-GROUP-1
  • set vpn ipsec site-to-site peer 203.0.113.10 local-address Site A public IP
  • set vpn ipsec site-to-site peer 203.0.113.10 tunnel 1 local prefix 192.168.1.0/24
  • set vpn ipsec site-to-site peer 203.0.113.10 tunnel 1 remote prefix 192.168.2.0/24

• NAT exemption example

  • set nat source rule 1000 description “VPN: Site B”
  • set nat source rule 1000 type 1

• Static routes example

• Verification commands

  • show vpn ipsec sa
  • show vpn ipsec status
  • ping 192.168.2.1 source 192.168.1.100

Frequently Asked Questions

Can EdgeRouter X do a site-to-site VPN?

Yes. EdgeRouter X supports IPsec site-to-site VPNs with remote peers using standard IPsec/IKE negotiations. You configure a tunnel between two networks, typically over the public internet, using a pre-shared key or certificates and consistent IKE/ESP settings. Unifi edge router vpn

What is required to set up an IPsec site-to-site VPN?

You need:

• Two EdgeRouter X devices or compatible routers with internet access
• Distinct private subnets for each site non-overlapping
• A public IP for each site or a dynamic DNS setup
• A shared authentication method pre-shared key or certificates
• IPsec/IKE configurations encryption, hashing, DH groups that match on both sides
• Routing and firewall rules to permit VPN traffic and route remote subnets

Should I use IKEv1 or IKEv2 for EdgeRouter X?

IKEv2 is generally preferred for better security and quicker rekeying, but some older devices or firmware versions may default to IKEv1. If both sides support IKEv2, choose it and ensure the ESP and SA lifetimes align. If you’re matching a legacy site, you can still use IKEv1 with compatible proposals.

How do I handle dynamic IP addresses at one site?

Use a dynamic DNS service to publish a hostname for the site’s public IP and configure the remote peer to use that hostname. Ensure the IPsec peer configuration can resolve the hostname and supports updating the peer’s address automatically.

Can I run multiple tunnels to the same remote site?

Yes, but you’ll need careful routing and policy configuration to ensure traffic uses the right tunnel and to avoid routing loops. In most cases, a single primary tunnel is sufficient, with a secondary tunnel as a failover option.

How can I test the VPN tunnel quickly?

From one site, try pinging a host on the remote subnet e.g., ping 192.168.2.1 from 192.168.1.x. Check the IPsec status with show vpn ipsec sa and show vpn ipsec status. If traffic doesn’t pass, verify firewall rules, NAT exemptions, and that the subnets on both sides don’t overlap. Free vpn for chrome vpn proxy veepn edge

What firewall rules should I implement for VPN traffic?

Create a dedicated zone or interface for VPN, and allow traffic between the VPN tunnel and the internal networks. At minimum, allow IP protocol 50 ESP and UDP ports 500 and 4500 for IKE and NAT-T if needed. Then restrict traffic so only intended subnets can reach across the tunnel.

How do I handle NAT when VPN is enabled?

Most site-to-site VPNs use NAT exemption so that traffic between the internal subnets doesn’t get NATed as it passes through the tunnel. You’ll typically configure a NAT rule that exempts traffic from the local subnet to the remote subnet when it’s destined for the VPN tunnel.

What are common causes of VPN tunnel not coming up?

• Mismatched PSK or IKE/ESP settings
• Subnet overlap between the two sites
• Firewall rules blocking IPsec traffic
• Dynamic IP or DNS issues if you’re not using a static public IP
• NAT misconfigurations or missing NAT-T support

How do I troubleshoot performance issues on EdgeRouter X VPN?

• Check CPU usage and observe if VPN encryption is maxing the processor
• Verify MTU settings to reduce fragmentation
• Consider lowering the encryption strength if performance is critical and security requirements allow
• Ensure firmware is up to date to benefit from performance and security improvements

Can I integrate a third-party VPN service with EdgeRouter X for site-to-site?

EdgeRouter X primarily supports IPsec site-to-site VPNs. If you need client-to-site VPN for remote workers or devices, you can use OpenVPN or WireGuard on a separate device or module, but it’s generally separate from the site-to-site tunnel. For external clients, combine a dedicated VPN server with your site-to-site VPN design, ensuring routing remains clear and secure.

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