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Yes, you can set up a site-to-site VPN on EdgeRouter X. In this guide, I’ll walk you through everything from the why to the how, with practical, copy-paste-ready steps you can adapt to your networks. You’ll learn how IPsec site-to-site works on EdgeRouter X, what you’ll need before you start, a solid step-by-step configuration, how to verify the tunnel, common pitfalls, and how to keep things secure and maintainable. If you’re curious about extra privacy while testing things out, NordVPN is currently offering a great deal 77% off + 3 months free — a good option for securing client devices during setup and testing. NordVPN deal: 77% OFF + 3 Months Free
In this post you’ll find:
– A quick overview of EdgeRouter X and IPsec site-to-site basics
– A practical prerequisites checklist
– A step-by-step setup guide with example configurations
– Tips for firewall rules, NAT exemptions, and routing support
– Troubleshooting, monitoring, and performance expectations
– A robust FAQ section to cover common questions
Note: Replace the example IPs and subnets with your actual WAN IPs and internal networks. All commands assume you’re logged into the EdgeRouter X via the CLI SSH or local console and are working in EdgeOS.
What is Edgerouter x vpn site to site and why use it
Site-to-site VPN is a secure tunnel between two networks, enabling devices on one side to communicate with devices on the other side as if they were on the same local network. With EdgeRouter X, you’re leveraging IPsec IKEv2 or IKEv1 depending on your setup to authenticate peers, encrypt traffic, and maintain a reliable tunnel across the internet. This setup is ideal for branch offices, partner networks, or a home lab linking multiple networks securely without exposing internal resources.
Why EdgeRouter X for site-to-site VPN?
– Compact, cost-effective router with solid routing capabilities
– IPsec site-to-site support via EdgeOS Vyatta-based
– Flexible firewall and NAT rules to tailor access between sites
– A large community and solid documentation for EdgeOS configurations
Key considerations:
– The EdgeRouter X isn’t a hardware VPN accelerator. performance depends on CPU limits and encryption strength. Expect practical throughput in hundreds of Mbps for typical AES-256 workloads, but always test with your own traffic patterns.
– You’ll need static or resolvable public IPs for both ends or up-to-date dynamic DNS setups, plus clear LAN/WAN subnet planning to avoid overlaps.
– NAT traversal and firewall rules matter a lot for successful tunnel establishment and stable traffic between sites.
Prerequisites and planning
Before you start, gather and verify these details:
– Public IPs of both endpoints or dynamic DNS setup if you don’t have static IPs
– Local networks LAN subnets for each site, e.g., Site A: 192.168.10.0/24, Site B: 192.168.20.0/24
– Remote network prefixes you want to reach from each site
– A pre-shared key PSK for IPsec authentication generate a strong PSK
– WAN interface on EdgeRouter X commonly eth0, but confirm with your hardware
– A plan for firewall rules to allow VPN traffic and to protect internal networks
– Optional: a backup plan if the VPN tunnel fails manual failover or secondary path
Pro tip: Document the IPs and subnets in a simple table. It makes future maintenance easier and helps when you need to audit or reconfigure.
Step-by-step guide: configuring IPsec site-to-site VPN on EdgeRouter X
Below is a practical, copy-ready sequence you can adapt. The commands assume Site A EdgeRouter X at 203.0.113.2 and Site B IP 203.0.113.4, with local subnet 192.168.10.0/24 at Site A and 192.168.20.0/24 at Site B. Replace these with your actual values.
1 Basic network and VPN prerequisites
– Confirm WAN IPs and internal subnets
– Ensure remote site is reachable ping test and firewall allows VPN traffic
2 Create IKE Phase 1 and IPsec Phase 2 groups
“`
set vpn ipsec ike-group IKEV2-1 proposal 1 encryption aes256
set vpn ipsec ike-group IKEV2-1 proposal 1 hash sha256
set vpn ipsec ike-group IKEV2-1 lifetime 3600
set vpn ipsec esp-group ESPV2-1 proposal 1 encryption aes256
set vpn ipsec esp-group ESPV2-1 proposal 1 hash sha256
set vpn ipsec esp-group ESPV2-1 lifetime 3600
3 Define the local and remote endpoints peers
set vpn ipsec site-to-site peer 203.0.113.4 authentication mode pre-shared-secret
set vpn ipsec site-to-site peer 203.0.113.4 authentication pre-shared-secret ‘YourStrongPSKHere’
set vpn ipsec site-to-site peer 203.0.113.4 ike-group IKEV2-1
set vpn ipsec site-to-site peer 203.0.113.4 esp-group ESPV2-1
4 Local identity and addressing
set vpn ipsec site-to-site peer 203.0.113.4 local-address 203.0.113.2
set vpn ipsec site-to-site peer 203.0.113.4 tunnel 1 local prefix 192.168.10.0/24
5 Remote prefix the network on the other side you want to reach
set vpn ipsec site-to-site peer 203.0.113.4 tunnel 1 remote prefix 192.168.20.0/24
6 NAT traversal and firewall considerations
If you’re behind NAT or need to traverse a firewall, enable NAT-traversal NAT-T and ensure traffic between the local and remote networks doesn’t get NATed in a way that breaks IPsec.
set vpn ipsec nat-traversal enable
7 Exclude VPN traffic from NAT NAT exemption
NAT exemption ensures traffic to the remote LAN isn’t translated, which can break site-to-site traffic.
set firewall group address-group VPN-LOCAL address 192.168.10.0/24
set firewall group address-group VPN-REMOTE address 192.168.20.0/24
set firewall modify NAT-EXEMPT rule 10 source group VPN-LOCAL
set firewall modify NAT-EXEMPT rule 10 destination group VPN-REMOTE
8 Apply and save
commit
save
9 Verify the tunnel status
– In EdgeOS you’ll see tunnel status via the GUI or run:
show vpn ipsec sa
– Look for a connected tunnel peer 203.0.113.4 and an established security association SA. If you don’t see a tunnel, double-check shared keys, endpoints, and that the remote site is reachable.
10 Routing and traffic flow
– Add routing so that traffic destined for the remote LAN uses the VPN tunnel. This often means ensuring the remote network is reachable via the tunnel and that there are static routes or policy-based routing rules directing 192.168.20.0/24 to the IPsec tunnel.
A few notes on the steps:
– The exact names of groups IKEV2-1, ESPV2-1 are examples. You can name them whatever you like, as long as you reference them consistently in the peer configuration.
– If you prefer IKEv1, you can adjust the configuration accordingly, but IKEv2 is generally more secure and robust for site-to-site VPNs.
– Replace the local and remote prefixes with your actual LAN subnets. If your site uses different WAN IPs or multiple WANs, you might need to adjust the “local-address” and add additional peers or failover logic.
– If you want to segregate VPN traffic or apply more granular firewall rules to the tunnel, you can define separate firewall rules and attach them to the VPN interface or create a dedicated VPN zone.
Security best practices for EdgeRouter X site-to-site VPN
– Use a strong pre-shared key PSK. Aim for a long, random PSK with a mix of characters.
– Prefer IKEv2 with AES-256 and SHA-256 for encryption and integrity.
– Regularly audit firewall rules to ensure only required traffic is allowed through the tunnel.
– Keep EdgeOS firmware updated to protect against known vulnerabilities.
– Consider using certificate-based authentication instead of PSK if you can manage CA infrastructure. EdgeOS supports RSA certificates for IPsec in some configurations.
– Maintain a clearly documented change log for all VPN configurations and network changes.
Common pitfalls and troubleshooting tips
– Tunnel not establishing: verify PSK matches on both sides, verify public IPs, and confirm the remote endpoint is reachable from your site.
– Phase 1/Phase 2 mismatch: ensure the same encryption, hashing, and lifetime settings on both sides.
– Overlapping networks: ensure the local and remote LAN subnets do not overlap. otherwise, routing won’t behave correctly.
– NAT issues: if NAT is altering IPs inside VPN traffic, ensure NAT exemptions are correctly configured and that NAT-T is enabled if required by your setup.
– Firewall blocking: confirm that the EdgeRouter firewall allows IPsec traffic ESP, AH if used through, and that traffic from your LAN to the remote LAN is permitted across the VPN.
– Dynamic IPs: if either site uses a dynamic IP, configure dynamic DNS on that edge and ensure the VPN is configured to reconnect when IP changes.
Advanced options and considerations
– Multi-site configurations: If you have more than two sites, you can extend the IPsec configuration to include multiple peers, each with its own tunnel and local/remote prefixes.
– Redundancy: For critical links, consider a secondary VPN path or a backup Internet connection to ensure tunnel continuity during outages.
– VPN monitoring: Enable logging for IPsec events and monitor tunnel status regularly. Consider setting up SNMP or a simple log alerting system to notify you of tunnel failures.
– Performance tuning: If you’re hitting throughput limits, review the ESP/IKE proposals and consider adjusting the crypto settings. Lighter ciphers may improve throughput but reduce security. balance according to your risk tolerance.
Real-world performance expectations
EdgeRouter X is a compact, budget-friendly router. As a result, VPN throughput will depend on your chosen ciphers, the size of your LANs, and the exact CPU load from other tasks. In typical scenarios with AES-256 and SHA-256, you might expect hundreds of Mbps of VPN throughput on a clean network with minimal other loads. In real-world home or small-office environments, you’ll often see VPN performance in the lower hundreds of Mbps, especially if you’re also routing other traffic through the device. If you need higher throughput or more robust performance, consider a more powerful EdgeRouter model or a dedicated VPN appliance for heavier traffic or more sites.
Best practices for maintenance and ongoing support
– Keep a copy of the working configuration in a safe place. A small script to back up the EdgeRouter config on a regular schedule can save you a lot of headaches.
– Periodically test the VPN by simulating failover or disconnect scenarios to ensure you know how to restore connectivity quickly.
– Review the VPN keys and credentials periodically and rotate PSKs according to your security policy.
– Document changes and the rationale behind each change. It makes future updates easier and helps new team members understand the network.
Real-world use cases for Edgerouter x vpn site to site
– Branch office connectivity: connect a remote office network to your main office network so users and devices can reach shared services securely.
– Partner network access: create a controlled, secure pipe to a partner’s network for specific resources.
– Remote lab access: link lab environments to a central management network without exposing internal resources to the public internet.
Frequently Asked Questions
# Question 1: What is EdgeRouter X?
EdgeRouter X is a compact, affordable router from Ubiquiti that runs EdgeOS a Vyatta-derived OS. It’s designed for flexible routing, firewalling, and VPN capabilities, including IPsec site-to-site configurations.
# Question 2: What is a site-to-site VPN?
A site-to-site VPN creates a secure tunnel between two networks, allowing devices on either side to communicate with each other as if they were on the same local network. It’s different from a remote access VPN, which connects individual devices to a network.
# Question 3: Do I need static IPs to run IPsec site-to-site VPN?
Static IPs simplify configuration and reliability, but you can use dynamic IPs with dynamic DNS services. The VPN endpoints still need to be reachable, and you’ll need a strategy for re-establishing the tunnel if an IP changes.
# Question 4: Can I use Preshared Keys PSK for IPsec?
Yes, PSK is common for IPsec site-to-site configurations. For better security, you can consider certificate-based authentication if you have a PKI in place, but PSK is simpler for small setups.
# Question 5: What about NAT and NAT traversal?
NAT-T is often necessary when VPN endpoints sit behind NAT. Enabling NAT traversal helps IPsec traffic cross NAT devices, but you should still configure NAT exemptions to ensure VPN traffic isn’tNATed unintentionally.
# Question 6: How do I verify the VPN tunnel is working?
Check the IPsec SA Security Association status on EdgeRouter X with commands like show vpn ipsec sa or through the EdgeOS GUI. Look for an established tunnel and an active SA for the connection to the remote peer.
# Question 7: How do I test connectivity across the VPN?
From a client on Site A, try pinging a host on Site B’s LAN for example, 192.168.20.25. Verify that traffic routes through the VPN tunnel and that replies come back. Traceroute can help verify the path.
# Question 8: What are common mistakes when configuring IPsec on EdgeRouter X?
Common mistakes include mismatched PSKs, mismatched IKE/ESP proposals, overlapping LAN subnets, and forgetting to add NAT exemptions. Also, misconfiguring the remote prefix can block traffic entirely.
# Question 9: How can I monitor and maintain the VPN?
Regularly check the tunnel status, SA counts, and recent log entries for IPsec. Consider setting up automated alerts for tunnel down events and maintain a changelog of VPN tweaks.
# Question 10: Can I connect more than two sites with IPsec on EdgeRouter X?
Yes, you can configure multiple IPsec peers, each with its own tunnel and prefixes. Manage the routing to ensure traffic chooses the correct tunnel and avoid subnets overlapping.
# Question 11: How secure is IPsec on EdgeRouter X?
IPsec with AES-256 and SHA-256 is generally secure for most small-to-medium deployments. Always keep firmware updated and rotate PSKs on a schedule. When possible, consider stronger authentication methods or certificates to reduce reliance on PSKs.
# Question 12: When should I upgrade from EdgeRouter X for VPN needs?
If you’re seeing sustained VPN throughput beyond a few hundred Mbps, or you need more parallel tunnels, better CPU/memory, or integrated hardware acceleration, it might be time to consider a more capable router or a dedicated VPN appliance.
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Useful resources and references unlinked for readability:
- EdgeRouter X official documentation
- EdgeOS IPsec site-to-site configuration guides
- IPsec concepts and best practices for small offices
- NAT traversal and firewall configuration for VPNs
- VPN testing and troubleshooting resources
- Networking fundamentals for home labs and branch offices
- Public IP and DNS considerations for VPN endpoints
- Dynamic DNS services and setup guides
- Subnet planning and address space management
- VPN monitoring and logging best practices
If you want to see the practical steps in action, I’ll be filming a step-by-step video showing the exact CLI entries, verification steps, and real-world testing. You’ll see how the tunnel comes up, how to troubleshoot common hiccups, and how to verify traffic flows across the VPN. If you’re setting this up for a small office or home lab, this video will help you get results quickly and avoid common misconfigurations.