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Edgerouter x site to site vpn is a secure, encrypted connection between two networks using EdgeRouter hardware.
In this guide, you’ll get a practical, reader-friendly walkthrough to configure a site-to-site VPN on an EdgeRouter X. We’ll cover planning, the exact commands you’ll paste into the EdgeOS CLI, firewall considerations, and post-setup testing. Whether you’re linking a home network to a small office or connecting two branches, this step-by-step approach helps you get a reliable tunnel up and running with IPsec. As you’re reading, consider keeping a spare test tunnel handy so you can verify changes without disturbing the primary link. And while you’re testing, NordVPN can be a handy extra layer of privacy for other experiments on your network—check out this deal: .
Useful URLs and Resources text only: Vpn on edgerouter: a complete guide to configuring IPsec, OpenVPN, and WireGuard alternatives on EdgeRouter
- EdgeRouter X official documentation – ubnt.com
- IPsec site-to-site VPN basics – en.wikipedia.org/wiki/IPsec
- EdgeOS documentation and help forum – help.ui.com
- Network security best practices for small offices – national cybersecurity guidelines example: nist.gov
Introduction: what you’ll learn in this post
- A clear plan for a two-site IPsec VPN using EdgeRouter X
- The exact EdgeOS CLI commands to create IKE and ESP proposals, peers, and tunnels
- How to map local and remote subnets, and how to handle NAT traversal
- Firewall rules, NAT exemptions, and routing considerations to make the tunnel usable
- Realistic troubleshooting tips and common gotchas
- How to monitor VPN health and verify traffic across the tunnel
Overview: why EdgeRouter X site-to-site VPN is a good fit
- EdgeRouter X delivers a compact, affordable option for small offices or home labs that need secure inter-site connectivity
- IPsec site-to-site VPN is widely supported by many vendors, making it easier to connect distant networks
- The EdgeRouter X uses EdgeOS Vyatta-inspired and provides a robust CLI for precise policy control
- You can run multiple VPN peers and define separate tunnels for different remote networks
Prerequisites and planning
- Hardware: EdgeRouter X ER-X with the latest EdgeOS firmware
- Internet connection on the WAN port with either a static IP or a dynamic IP in which case you’ll want dynamic DNS
- Two sites: Local site Site A and Remote site Site B each with its own LAN subnet for example, Site A 192.168.1.0/24, Site B 192.168.2.0/24
- A pre-shared key PSK for IPsec authentication on both sides
- Remote network information: public IP addresses or dynamic DNS hosts for the two sites
- Basic firewall rules to allow IPsec traffic ESP and IKE on port 500/4500
- Optional: a plan for NAT exemption to ensure traffic between the sites isn’t double-NAT’ed
Topology example typical
- Site A: EdgeRouter X at 203.0.113.10, LAN 192.168.1.0/24
- Site B: Router at 198.51.100.20, LAN 192.168.2.0/24
- VPN tunnel: IKEv2/ESP with AES-256, a 3600-second lifetime, and a pre-shared secret
- NAT: disable NAT for traffic that should traverse the VPN between the two subnets or set up proper NAT exemptions
Step-by-step: configuring Edgerouter X for a site-to-site VPN
Step 1: Plan your VPN topology and subnet mappings What is k edge
- Decide which subnets will be reachable across the tunnel e.g., 192.168.1.0/24 <-> 192.168.2.0/24
- Confirm each site’s public IPs or dynamic DNS hostnames and ensure they’re reachable
- Determine theIKE IKE Phase 1 and ESP Phase 2 proposals you’ll use encryption, hash, and DH groups
- Outline firewall rules that will allow IKE UDP 500, UDP 4500 and IPsec ESP traffic across the tunnel
Step 2: Create IKE and ESP proposals
In EdgeOS, you’ll set up the IKE group and ESP group so both sides agree on the crypto parameters.
-
Create an IKE group with strong crypto:
- Encryption: AES256
- Hash: SHA256
- DH group: 14 2048-bit
- Lifetime: 3600 seconds
-
Create an ESP group:
Example commands paste into the EdgeRouter X CLI:
configure
set vpn ipsec ike-group IKE-1 proposal 1 encryption aes256
set vpn ipsec ike-group IKE-1 proposal 1 hash sha256
set vpn ipsec ike-group IKE-1 proposal 1 dh-group 14
set vpn ipsec ike-group IKE-1 lifetime 3600
set vpn ipsec esp-group ESP-1 proposal 1 encryption aes256
set vpn ipsec esp-group ESP-1 proposal 1 hash sha256
set vpn ipsec esp-group ESP-1 lifetime 3600
commit
save
exit
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- You can adjust the lifetime e.g., 3600 seconds to match your policy. Some admins use 3600 or 28800. pick what your remote side supports.
- If you’re behind NAT or using dynamic IPs, you might want to tweak the NAT-t NAT traversal behavior later in the tunnel configuration.
Step 3: Define the VPN peer remote site and associate the IKE/ESP groups
- You’ll specify the remote public IP or hostname if you’re using dynamic DNS and the PSK.
- Link the IKE group and the ESP group you created.
Example commands:
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 YourPresharedSecret
set vpn ipsec site-to-site peer 203.0.113.1 ike-group IKE-1
set vpn ipsec site-to-site peer 203.0.113.1 default-esp-group ESP-1
set vpn ipsec site-to-site peer 203.0.113.1 tunnel 1 local-prefix 192.168.1.0/24
set vpn ipsec site-to-site peer 203.0.113.1 tunnel 1 remote-prefix 192.168.2.0/24
set vpn ipsec site-to-site peer 203.0.113.1 tunnel 1 local-id 203.0.113.10
set vpn ipsec site-to-site peer 203.0.113.1 tunnel 1 remote-id 198.51.100.20
- Replace 203.0.113.1 with your remote site’s public IP or dynamic DNS hostname if applicable.
- Replace 192.168.1.0/24 and 192.168.2.0/24 with your actual local and remote subnets.
- local-id and remote-id are optional in many setups but can help with ID-based policies on some devices.
Step 4: Ensure NAT exemptions no double NAT for tunnel traffic
- The goal is to let traffic between the two subnets go directly through the VPN, without being NAT’ed at the local router.
set nat source rule 1000 description ‘VPN-exempt local-to-remote’
set nat source rule 1000 outbound-interface eth0
set nat source rule 1000 source address 192.168.1.0/24
set nat source rule 1000 translation address 0.0.0.0
set nat source rule 1000 use ipsec tunnel 1
- You may not need a NAT rule if your devices are on private networks that don’t require NAT for inter-site traffic. The important part is to ensure traffic across tunnels is not translated in a way that breaks remote routing.
Step 5: Firewall considerations allow IPsec and tunnel traffic Download edge vpn mod apk for Android: risks, legality, safety tips, and the best legitimate vpn alternatives in 2025
- Allow IKE UDP 500 and NAT-T UDP 4500 through your WAN firewall.
- Allow IPsec ESP protocol 50 if you filter at a more granular level.
set firewall name WAN-IN rule 10 action accept
set firewall name WAN-IN rule 10 description ‘allow IKE’
set firewall name WAN-IN rule 10 protocol udp
set firewall name WAN-IN rule 10 destination port 500
set firewall name WAN-IN rule 11 action accept
set firewall name WAN-IN rule 11 description ‘allow NAT-T’
set firewall name WAN-IN rule 11 protocol udp
set firewall name WAN-IN rule 11 destination port 4500
set firewall name WAN-IN rule 12 action accept
set firewall name WAN-IN rule 12 description ‘IPsec ESP’
set firewall name WAN-IN rule 12 protocol esp
- If you’re using a different firewall schema, adapt the rules accordingly. The essential idea is to permit IPsec traffic while protecting the WAN interface.
Step 6: Testing the VPN connection
- Check the status: verify that the IPsec peer is up, and that tunnel 1 is actively transmitting.
- Use the EdgeRouter’s GUI or CLI to view status:
- CLI: show vpn ipsec sa
- CLI: show vpn ipsec tunnel
- Logs: show log | match ipsec
- Validate traffic flow:
- From a host in Site A 192.168.1.0/24, ping a host in Site B 192.168.2.0/24
- Confirm ARP works across subnets and that replies come back through the tunnel
Troubleshooting common issues Proton vpn edge extension
- Problem: Tunnel won’t come up
- Check PSK consistency on both sides
- Confirm that both peers see matching IKE and ESP proposals
- Verify that the remote site’s public IP or DNS name is reachable
- Ensure firewall rules aren’t blocking IKE/ESP
- Problem: Phase 2 SA negotiation failing
- Review local and remote subnets. ensure you didn’t mix up the local/remote prefixes
- Confirm that ESP group matches on both sides
- Problem: Bidirectional traffic not flowing
- Confirm the tunnel is UP. look for NAT-exemption issues
- Verify routing entries on both devices. static routes might be necessary for remote networks
- Problem: Performance concerns
- EdgeRouter X has limited processing power. expect some CPU overhead from IPsec, especially on AES-256
- Consider lowering the encryption strength or tweaking MTU to minimize fragmentation
- Problem: Dynamic IP at one site
- Use a dynamic DNS service or a VPN that supports DDNS on the peer
- Ensure you keep the remote peer updated if IP addresses change
Security considerations and best practices
- Use strong keys and rotate the PSK periodically
- When possible, use unique PSKs per site-to-site pair
- Keep EdgeOS firmware up to date to benefit from security patches and bug fixes
- Enable logging for VPN events and monitor regularly for unusual activity
- Document your topology, subnets, and PSKs securely in a password-protected vault
- Consider periodic audits to verify that firewall rules and NAT exemptions are still correct
Performance and scale: what to expect
- EdgeRouter X is designed for small to mid-sized home/office use. IPsec with AES-256 will add CPU load, so expect some hit to throughput compared to plain routing
- Real-world throughput depends on your hardware, firmware, and tunnel configuration
- If you need higher performance or more tunnels, you may look at higher-end EdgeRouter models or dedicated VPN appliances
- For occasional failover or remote-access use, ER-X’s capabilities are usually more than enough
Open-source and alternatives
- EdgeRouter X focuses on stability and a CLI-driven approach. it supports IPsec site-to-site well
- Some users explore OpenVPN or WireGuard as alternatives for certain environments, but WireGuard support historically lagged on EdgeOS. check current firmware releases for the latest status
- If you need to integrate with a firewall appliance or a cloud VPN solution, ensure you map the same crypto parameters to maintain compatibility
Monitoring and maintenance
- Set up a simple alerting routine for VPN status and uptime
- Periodically verify the tunnel by testing from both sides
- Keep a change log for any policy updates or firmware upgrades
- Use logs to catch issues like phase 1/2 negotiation failures or misrouted traffic
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- Use separate tunnels for separate remote networks if you’re handling multiple sites
- Consider implementing pfs perfect forward secrecy by enabling DH groups and ensuring they’re consistent on both sides
- If you’re encountering NAT-related glitches, explicitly set up NAT traversal for IPsec, and consider disabling NAT on one side for the tunnel traffic
- For sites with asymmetrical routing, you may need to adjust route metrics or use policy-based routing to steer traffic into the tunnel
Conclusion: a quick recap
- You can successfully set up a site-to-site IPsec VPN on EdgeRouter X with careful planning, matching crypto parameters, and properly configured firewall and NAT rules
- Start with a small lab setup to verify end-to-end connectivity before expanding to multiple sites
- Regular checks and updates help keep the tunnel reliable over the long term
Frequently Asked Questions
What is the EdgeRouter X site-to-site VPN best used for?
A site-to-site VPN on EdgeRouter X securely connects two separate networks over the internet, enabling seamless resource sharing and remote connectivity for devices on both sides.
Do I need a static IP on both sites?
Static IPs simplify configuration and reliability, but you can use dynamic DNS if one or both sites have dynamic public IPs. You’ll need to keep the remote end updated when IPs change.
Can I use this with dynamic DNS?
Yes. Use a dynamic DNS hostname on the remote site and configure the peer accordingly. Make sure your DDNS service updates propagate to the other site. Does edge have its own vpn
What protocols should I use for IPsec?
AES-256 for encryption and SHA-256 for hashing are common defaults. DH group 14 is a typical choice for Phase 1. You can adjust these to fit your security policy and device compatibility.
How do I test the VPN tunnel?
Ping hosts across the VPN, check VPN SA status with the CLI, and verify routing tables show the remote subnet as reachable through the tunnel. Look for packet loss and latency spikes as indicators.
Can I run more than one site-to-site VPN on the same EdgeRouter X?
Yes, you can configure multiple VPN peers, but you’ll allocate distinct tunnels and possibly separate subnets for each site. Ensure the hardware can handle the combined load.
How do I handle NAT for VPN traffic?
Configure NAT exemptions so traffic between the two sites isn’t translated, or set up precise NAT rules that only translate traffic destined for the local internet, not the remote network.
What are common mistakes when setting up EdgeRouter X VPNs?
Common mistakes include mismatched PSKs, misconfigured local/remote subnets, wrong IKE/ESP proposals, firewall blocks for ESP/IKE, and forgetting to add NAT exemptions. Zenmate free vpn firefox
How can I monitor the VPN health over time?
Regularly run connectivity tests, review IPsec SA status, enable VPN logs, and use simple network monitors to track tunnel uptime, jitter, and packet loss.
Is OpenVPN or WireGuard a better fit than IPsec on EdgeRouter X?
EdgeRouter X is well-suited for IPsec, which is widely interoperable with many devices. OpenVPN is possible on EdgeOS in some configurations, and WireGuard support has evolved over firmware releases. Check your current EdgeOS version for the latest capabilities and compatibility with your remote peers.
What performance should I expect with AES-256 on ER-X?
Performance varies by firmware version and traffic mix, but you should anticipate some CPU overhead, which can reduce raw throughput compared to non-encrypted routing. For many small offices and home labs, several hundred Mbps of IPsec throughput is achievable depending on configuration.
How do I rotate the pre-shared key securely?
Rotate PSKs by updating both sides at the same time, then re-verify the tunnel. Use strong, random keys stored in a password manager or a secure vault, and document the rotation schedule.
Can I use the EdgeRouter X for a hub-and-spoke VPN topology?
Absolutely. You can configure multiple site-to-site tunnels to connect to multiple remote sites. Just ensure you plan the subnets and firewall rules carefully to avoid routing loops and NAT issues. How to access edge vpn
How do I troubleshoot if the tunnel goes down after a firmware update?
Re-check the IKE/ESP proposals, re-apply the PSK, validate that the remote peer IP hasn’t changed, and confirm that firewall rules still permit IPsec traffic. Sometimes a firmware update resets certain settings, so you may need to re-enter the tunnel configuration.