Edgerouter vpn site to site setup guide for ipsec tunnels between edgerouters using ikev2 psk and esp: Comprehensive Tutorial, Troubleshooting, and Best Practices

Edgerouter vpn site to site setup guide for ipsec tunnels between edgerouters using ikev2 psk and esp. Quick facts: this guide covers configuring IPsec site-to-site VPNs on Ubiquiti EdgeRouter devices using IKEv2 with PSK and ESP, with step-by-step commands, practical tips, and troubleshooting tips.

• What you’ll learn:
  • How to prepare both EdgeRouter devices for a secure IPsec tunnel
  • How to generate and configure IKEv2 with PSK
  • How to set up ESP for encryption and integrity
  • How to establish tunnel networks, policies, and routing
  • How to verify connectivity and diagnose common issues
  • Best practices for security, redundancy, and monitoring

Useful URLs and Resources text only, not clickable

• EdgeRouter Documentation – edge.router/edgerouter
• Ubiquiti Support – help.ubiquiti.com
• IPSec VPN Overview – en.wikipedia.org/wiki/IPsec
• IKEv2 Overview – en.wikipedia.org/wiki/Internet_Key_Exchange
• ESP Encryption Standards – en.wikipedia.org/wiki/Encapsulating_Security_Payload
• VPN Troubleshooting Guide – community.ui.com

Why this setup matters and prerequisites

IPsec site-to-site VPNs are a reliable way to connect two separate networks securely over the internet. For EdgeRouter devices, a consistent IKEv2 PSK pre-shared key approach is straightforward and robust when paired with ESP for encryption.

Before you start, gather:

• Public IP addresses or dynamic DNS names for both edge devices
• A fixed/shared PSK for IKEv2 keep it strong and unique
• Subnets that should reach each other across the tunnel
• Access to the EdgeRouter GUI or SSH for both devices
• Basic firewall rule planning to permit VPN traffic

Common prerequisites:

• Firmware up to date on both EdgeRouter devices
• Correct time and date on both devices for certificate-like behavior in IKE
• No conflicting VPN configurations on either device

High-level architecture and tunnel design

• One tunnel, two endpoints, two networks
• Phase 1 IKE uses IKEv2 with PSK for mutual authentication
• Phase 2 IPsec uses ESP for encryption, with a chosen ESP mode AES-128 or AES-256, depending on hardware capability
• Traffic selectors defined as local_subnet <-> remote_subnet
• Optional: Dead Peer Detection DPD for quick failover

Step-by-step: EdgeRouter A local configuration

Note: adjust IPs, subnets, and PSK to your environment.

1. Define variables pseudo-usage for readability

• Local LAN: 192.168.10.0/24
• Remote LAN: 192.168.20.0/24
• Remote peer public IP:203.0.113.2
• IKE PSK: SuperStrongP@ssw0rd!
• Local WAN IP: 203.0.113.1

2. Configure IKEv2 and IPsec using CLI

• Create a VPN policy:
  • set vpn ipsec ike-group IKEV2-PSK proposal 1 encryption aes256
  • set vpn ipsec ike-group IKEV2-PSK proposal 1 hash sha256
  • set vpn ipsec ike-group IKEV2-PSK lifetime 28800
  • set vpn ipsec esp-group ESP-256 proposal 1 encryption aes256
  • set vpn ipsec esp-group ESP-256 proposal 1 hash sha256
  • set vpn ipsec esp-group ESP-256 lifetime 3600
• Define PSK:
  • set vpn ipsec psk 1 local-address 203.0.113.1
  • set vpn ipsec psk 1 peer 203.0.113.2 sha256 SuperStrongP@ssw0rd!
• Create the site-to-site tunnel:
  • set vpn ipsec site-to-site peer 203.0.113.2 authentication mode pre-shared-secret
  • set vpn ipsec site-to-site peer 203.0.113.2 authentication pre-shared-secret SuperStrongP@ssw0rd!
  • set vpn ipsec site-to-site peer 203.0.113.2 ike-group IKEV2-PSK
  • set vpn ipsec site-to-site peer 203.0.113.2 default-esp-group ESP-256
  • set vpn ipsec site-to-site peer 203.0.113.2 tunnel 1 local prefix 192.168.10.0/24
  • set vpn ipsec site-to-site peer 203.0.113.2 tunnel 1 remote prefix 192.168.20.0/24
• Enable DPD and NAT traversal if needed:
  • set vpn ipsec site-to-site peer 203.0.113.2 dpd on-idle
  • set vpn ipsec site-to-site peer 203.0.113.2 nat traversal on

3. Firewall rules to permit VPN traffic

• Allow IPsec UDP 500, UDP 4500 if NAT-T
• Allow ESP protocol 50
• Permit traffic between local and remote subnets via the tunnel

4. Commit and save

• commit
• save

Step-by-step: EdgeRouter B remote configuration

Mirror the settings on the remote device with the opposite subnets and public IPs: Edge vpn mod apk premium unlocked 2026

• Local LAN: 192.168.20.0/24
• Remote LAN: 192.168.10.0/24
• Remote peer public IP: 203.0.113.1
• IKE PSK: SuperStrongP@ssw0rd!

Follow the same sequence for:

• IKEv2 group, ESP group
• PSK configuration
• Site-to-site tunnel with tunnel 1: local 192.168.20.0/24, remote 192.168.10.0/24
• Firewall adjustments for VPN traffic

Verify the tunnel status and connectivity

• Check tunnel status on both devices:
  • Look for a phase 1 IKE and phase 2 IPsec up state
  • Confirm the tunnel is active and shows the remote endpoint
• Test routing:
  • From a host in 192.168.10.0/24, ping a host in 192.168.20.0/24
  • Test reverse connectivity as well
• Debug if needed:
  • Use show vpn ipsec sa to view security associations
  • Check for logs indicating failed PSK or mismatch in proposals
  • Confirm remote subnets are reachable via the tunnel
• Verify MTU and fragmentation:
  • If large packets fail, consider lowering MTU or enabling path MTU discovery

Common issues and quick fixes

• PSK mismatch: Reconfirm the exact same PSK on both sides
• Proposal mismatch: Ensure both sides use the same encryption and hashing settings AES-256, SHA-256, etc.
• NAT-T problems: If behind NAT, ensure UDP 4500 is allowed and NAT-T is enabled
• Firewall blocking: Double-check inbound/outbound rules for VPN traffic
• DNS leakage: Consider using internal DNS resolution to avoid leaking internal hostnames

Security and best practices

• Use strong, unique PSKs and rotate them periodically
• Prefer AES-256 if hardware supports it
• Enable DPD to detect dead peers quickly
• Keep EdgeRouter firmware updated
• Document VPN topology and PSKs securely
• Consider monitoring VPN uptime and logging for quick incident response
• Plan for redundancy with a secondary WAN link and failover

Performance considerations

• ESP encryption adds CPU load; ensure your EdgeRouter model can sustain the expected throughput
• For high-traffic sites, monitor CPU usage and adjust MTU to optimize performance
• Use keepalive/DPD settings to maintain tunnel health without excessive traffic

Advanced topics and variations

• Multiple subnets: If you have multiple remote subnets, create additional tunnel configurations or adjust local/remote prefixes accordingly
• Dynamic DNS: If your public IP changes, pair with a dynamic DNS name and ensure the peers resolve it correctly
• Dual-tunnel redundancy: Set up two IPsec tunnels with separate PSKs and distinct peers for high availability
• Cloud deployments: EdgeRouter devices can connect to cloud VPN gateways using the same principles with adjusted peers and subnets

Quick-reference cheat sheet

• IKE: IKEv2 with PSK
• ESP: AES-256 with SHA-256
• Local networks: define exact subnets on each side
• NAT-T: enabled if behind NAT
• DPD: enabled for quick failover
• Monitoring: verify with ping/traceroute and VPN status commands

Tables: common settings example

• Local: 192.168.10.0/24
• Remote: 192.168.20.0/24
• Public IP local: 203.0.113.1
• Public IP remote: 203.0.113.2
• IKE group: IKEV2-PSK
• ESP group: ESP-256
• PSK: SuperStrongP@ssw0rd!

Troubleshooting workflow step-by-step

1. Confirm peer reachability
2. Verify PSK on both sides
3. Check IKE SA status
4. Check IPsec SA status
5. Test connectivity between subnets
6. Review firewall rules for VPN traffic
7. Inspect logs for error codes and messages
8. Reboot or reinitialize tunnel if necessary
9. Validate MTU and fragmentation issues

Real-world tips from practitioners

• Pro tip: Keep a small, separate test subnet to validate VPN behavior without impacting production
• Pro tip: Maintain a documented change log whenever you rotate PSKs or adjust tunnel parameters
• Pro tip: Use descriptive naming for tunnels to avoid confusion in multi-site deployments

Performance and monitoring tools

• Built-in EdgeRouter monitoring: CPU, memory, and VPN tunnel status
• Network monitoring tools: ping tests, traceroute, and remote network reachability checks
• Logs: VPN-related logs for IKE/IPsec events and errors

Frequently asked questions

What is IPsec and why use IKEv2 with PSK?

IPsec provides secure communication over untrusted networks. IKEv2 with PSK offers strong authentication and fast tunnel setup with simplified key management.

Can I run multiple tunnels on a single EdgeRouter?

Yes, you can configure multiple IPsec site-to-site tunnels, but ensure unique peer definitions and proper routing for each tunnel’s subnets.

What if the remote peer’s IP changes?

If you have dynamic IPs, use dynamic DNS on both sides and configure the peers to resolve each other by their domain names.

How do I test the tunnel after setup?

Ping hosts across the tunnel, check VPN status via CLI/GUI, and review logs for any errors. Edge router x vpn server setup guide for EdgeRouter X with OpenVPN, IPsec, and WireGuard considerations 2026

How do I rotate the PSK securely?

Schedule a maintenance window, update the PSK on both sides, and monitor the tunnel until it re-establishes with the new PSK.

What encryption should I choose for ESP?

AES-256 is the gold standard for many networks, but AES-128 can be sufficient for lighter loads. Match both sides.

Are there any common pitfalls with EdgeRouter and IPsec?

Mismatched proposals, PSK typos, NAT-T issues, and firewall misconfigurations are the usual culprits.

How do I enable NAT traversal?

Enable NAT-T on both peers so IPsec can function correctly when devices are behind a NAT.

How can I improve VPN reliability?

Add Dead Peer Detection, monitor health, and consider an additional redundant tunnel with a different peer if possible. Edgerouter site-to-site vpn 2026

Where can I find more advanced EdgeRouter VPN options?

Refer to EdgeRouter official documentation and community guides for advanced routing and firewall rules.

Here’s a practical, copy‑paste friendly guide to set up a site‑to‑site IPsec VPN between two Ubiquiti EdgeRouters using IKEv2 with a pre‑shared key PSK and ESP. The steps assume both sides are EdgeRouters running a reasonably recent EdgeOS version that supports IKEv2. If you’re on an older firmware, some terms may differ slightly IKEv1 is more common there.

High‑level plan

• Use IKEv2 with a PSK for authentication.
• Use ESP for the tunnel’s encryption/decryption.
• Route traffic between two LAN subnets across the VPN site A LAN <-> site B LAN.
• If either site is behind NAT, enable NAT‑Traversal NAT‑T on IPsec.
• Ensure basic firewall rules allow IPsec and VPN traffic, and that the VPN subnets aren’t NATed against each other.

Assumptions for the example

• Site A EdgeRouter public IP: 203.0.113.10
• Site A LAN: 192.168.10.0/24
• Site B EdgeRouter public IP: 198.51.100.20
• Site B LAN: 192.168.20.0/24
• PSK: Edger0utPSK2024!
• External interfaces: eth0 Site A and eth0 Site B
• You want a single tunnel Tunnel 1 for the two LAN subnets. You can add more tunnels later if needed.

What you’ll configure on both sides outline Edge secure network vpn missing 2026

• IPsec IKE group IKEv2 with appropriate crypto AES256, SHA256, DH 14, lifetime
• IPsec ESP group ESP with encryption, hash, PFS, lifetime
• IPsec site‑to‑site peer: remote public IP, PSK, IKE group, ESP group
• Local/subnet definitions for the tunnel local-subnet and remote-subnet
• Enable NAT‑Traversal if behind NAT
• Basic firewall allowances to permit IPsec/IKE and VPN traffic
• Verification steps to confirm the tunnel is up and traffic can pass

EdgeRouter CLI copy/paste blocks you can adapt
Note: The exact syntax can vary a little by firmware version. If you see a mismatch, use the GUI as an alternative approach, or consult your exact version’s docs.

1. Common pre-steps do on both sides

• Make sure the IPsec interfaces can use the tunnels
• Turn on NAT-T if needed

Set vpn ipsec ipsec-interfaces interface eth0
set vpn ipsec options enable-nat-traversal ‘true’

2. IKE and ESP crypto groups IKEv2, ESP
   Edge A Site A example:
   set vpn ipsec ike-group IKE-V2 proposal 1 encryption ‘aes256’
   set vpn ipsec ike-group IKE-V2 proposal 1 hash ‘sha256’
   set vpn ipsec ike-group IKE-V2 proposal 1 dh-group 14
   set vpn ipsec ike-group IKE-V2 ike-version ‘v2’
   set vpn ipsec ike-group IKE-V2 lifetime 28800

Set vpn ipsec esp-group ESP-V2 proposal 1 encryption ‘aes256’
set vpn ipsec esp-group ESP-V2 proposal 1 hash ‘sha256’
set vpn ipsec esp-group ESP-V2 lifetime 3600
set vpn ipsec esp-group ESP-V2 pfs ‘on’

3. Site‑to‑site peer configuration IPsec tunnel
   Edge A to Site B 198.51.100.20:
   set vpn ipsec site-to-site peer 198.51.100.20 authentication mode ‘pre-shared-secret’
   set vpn ipsec site-to-site peer 198.51.100.20 authentication pre-shared-secret ‘Edger0utPSK2024!’
   set vpn ipsec site-to-site peer 198.51.100.20 ike-group ‘IKE-V2’
   set vpn ipsec site-to-site peer 198.51.100.20 default-esp-group ‘ESP-V2’
   set vpn ipsec site-to-site peer 198.51.100.20 local-address ‘203.0.113.10’
   set vpn ipsec site-to-site peer 198.51.100.20 tunnel 1 local-subnet ‘192.168.10.0/24’
   set vpn ipsec site-to-site peer 198.51.100.20 tunnel 1 remote-subnet ‘192.168.20.0/24’

4. Repeat on Site B swap the subnets and public IPs
   Edge B Site B example:
   set vpn ipsec ike-group IKE-V2 proposal 1 encryption ‘aes256’
   set vpn ipsec ike-group IKE-V2 proposal 1 hash ‘sha256’
   set vpn ipsec ike-group IKE-V2 proposal 1 dh-group 14
   set vpn ipsec ike-group IKE-V2 ike-version ‘v2’
   set vpn ipsec ike-group IKE-V2 lifetime 28800 Edge vpn kya hai 2026

Set vpn ipsec esp-group ESP-V2 proposal 1 encryption ‘aes256’
set vpn ipsec esp-group ESP-V2 proposal 1 hash ‘sha256’
set vpn ipsec esp-group ESP-V2 lifetime 3600
set vpn ipsec esp-group ESP-V2 pfs ‘on’

Edge B peer to Site A 203.0.113.10:
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 ‘Edger0utPSK2024!’
set vpn ipsec site-to-site peer 203.0.113.10 ike-group ‘IKE-V2’
set vpn ipsec site-to-site peer 203.0.113.10 default-esp-group ‘ESP-V2’
set vpn ipsec site-to-site peer 203.0.113.10 local-address ‘198.51.100.20’
set vpn ipsec site-to-site peer 203.0.113.10 tunnel 1 local-subnet ‘192.168.20.0/24’
set vpn ipsec site-to-site peer 203.0.113.10 tunnel 1 remote-subnet ‘192.168.10.0/24’

5. Optional but recommended: firewall considerations

• Ensure firewall allows IPsec/IKE and ESP
• Allow traffic between the two LAN subnets across the VPN

Example minimal guidance adjust to your firewall names/nodes:

• Allow UDP 500 and UDP 4500 on the WAN interfaces IKE and NAT-T
• Allow IP protocol 50 ESP if your firewall requires explicit ESP rule
• Allow traffic from 192.168.10.0/24 to 192.168.20.0/24 and back

If you prefer the GUI EdgeOS Web UI

• Go to VPN > IPsec
• Create an IKE Group named for example IKE-V2:
  • IKE version: v2
  • Encryption: AES-256
  • Hash: SHA-256
  • DH Group: 14 2048
  • Lifetime: 28800
• Create an ESP Group named ESP-V2:
  • Encryption: AES-256
  • Hash: SHA-256
  • PFS: On
  • Lifetime: 3600
• Create a peer Site B with:
  • Remote Address: Site B public IP
  • Authentication: Pre-Shared Key
  • Pre-Shared Key: Edger0utPSK2024!
  • IKE Group: IKE-V2
  • ESP Group: ESP-V2
  • Local Address: Site A public IP
  • Local Subnet: 192.168.10.0/24
  • Remote Subnet: 192.168.20.0/24
  • Tunnel 1 local/remote subnets
• Repeat for Site B with swapped subnets
• Enable NAT-T if needed and adjust firewall rules to permit IPsec/IKE and traffic between subnets
• Save and apply

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• Check tunnel status
  • CLI: show vpn ipsec sa
  • CLI: show vpn ipsec status
  • GUI: IPsec status page
• Test connectivity
  • From a host on 192.168.10.0/24, ping a host on 192.168.20.0/24 and vice versa
  • If you have a gateway on the remote LAN, test route reachability e.g., ping 192.168.20.1 from 192.168.10.1
• If the tunnel isn’t up, common checks
  • Time: Ensure both routers have accurate clocks NTP recommended – IKEv2 is sensitive to time skew.
  • PSK mismatch: Recheck the pre‑shared secret on both sides exactly case sensitive, no extra spaces.
  • Public IPs: Confirm you’re using the correct remote/public IPs in each peer entry.
  • IKEv2 on both sides: Confirm both sides are configured for IKEv2 not IKEv1.
  • NAT-T: If either side is behind NAT, NAT‑T must be enabled on IPsec.
  • Subnets: Ensure local-subnet and remote-subnet definitions do not overlap and correctly reflect the actual LANs behind each EdgeRouter.
  • Firewall: Make sure the firewall allows the IPsec traffic IKE, NAT-T, ESP and the VPN traffic between the two LANs.
  • Logs: Check system logs for IPsec negotiation messages. On EdgeRouter: show log messages or logread for “ipsec” to see negotiation steps and failures.

Common issues and quick fixes

• If IKE negotiates but the tunnel won’t pass traffic: verify that the two LAN subnets don’t require extra routes; ensure the remote’s LAN is reachable through the tunnel; check that there’s a return route for the remote LAN on each side.
• If the tunnel drops after a few minutes: check rekey timers mismatches or PH1/PH2 issues; ensure both sides use the same IKEv2 settings and lifetime.
• If you’re behind CGNAT or ISP NAT: NAT‑T is essential; confirm it’s enabled on both sides.
• If you want multiple subnets behind each site: you can add additional tunnels Tunnel 2, 3, … with corresponding local/remote subnets, using different remote subnets as needed.

A quick sanity reminder

• IKEv2 with PSK is straightforward but requires exact symmetry: same PSK on both sides, matching IKE and ESP groups, and correctly defined local/remote subnets.
• EdgeRouter’s IPsec is policy-based tunnels map to local-subnet/remote-subnet. If you later switch to a route-based approach, you’d configure differently less common on EdgeOS for straightforward site‑to‑site with two subnets.

If you’d like, tell me the exact EdgeRouter models and firmware versions you’re running, plus your actual LAN subnets and public IPs. I’ll tailor the exact, copy‑paste CLI blocks for both sides to your setup and include a precise validation checklist.

Edgerouter vpn site to site is a method to securely connect two remote networks over the internet using IPsec tunnels on EdgeRouter devices.

If you’re here, you probably want a reliable, repeatable way to link two offices or home networks. In this guide I’ll walk you through what a site-to-site VPN on EdgeRouter actually is, the prerequisites you’ll need, a clear step-by-step setup using EdgeOS, real-world tips to avoid common gotchas, how to test and verify the tunnel, and a few troubleshooting tricks. We’ll cover both typical static IP scenarios and setups where one side sits behind NAT or uses a dynamic IP. Plus, I’ll include practical security best practices so that your tunnel isn’t just working, but solid. Edge vpn download free: a comprehensive guide to Edge Secure Network and VPN extensions for the Edge browser in 2026

– Quick overview of what you’ll learn:
– What a site-to-site IPsec VPN on EdgeRouter does and when to use it
– Prerequisites like public IPs, subnets, and PSK choices
– Step-by-step EdgeOS commands to create IKE and IPsec tunnels
– How to configure firewall rules and NAT traversal for IPsec
– How to test connectivity and verify tunnel status
– Common fail points and how to fix them
– Real-world tips for multi-site setups and performance considerations

For extra protection beyond the tunnel, you can check out NordVPN’s limited-time offer here:

NordVPN offer note: This is an affiliate link. If you click through and subscribe, the site may earn a commission at no extra cost to you. I only promote services I believe add value to readers.

Useful URLs and Resources unlinked, plain text
– Ubiquiti EdgeRouter official documentation – help.ubiquiti.com
– EdgeRouter community forums – community.ubiquiti.com
– IPsec basics on Wikipedia – en.wikipedia.org/wiki/IPsec
– IKEv2 overview and best practices – en.wikipedia.org/wiki/IKEv2
– NAT traversal NAT-T basics – en.wikipedia.org/wiki/Network_address_translation
– EdgeOS CLI reference – help.ubiquiti.com/hc/en-us/articles/115005233165-EdgeRouter-CLI
– Local network planning tips – cisco.com/c/en/us/products/security-vpn.html
– Private IP address planning guidelines – en.wikipedia.org/wiki/Private_network
– VPN throughput considerations – networkcomputing.com

What is a site-to-site VPN on EdgeRouter?

A site-to-site VPN creates a secure, encrypted tunnel between two distinct networks over the public internet. In an EdgeRouter context, you configure IPsec IKE and ESP to ensure traffic between the local networks for example, 10.0.0.0/24 on Site A and 192.168.1.0/24 on Site B travels through an encrypted channel. This is different from a remote-access VPN, where individual clients connect to a single gateway. With site-to-site, you get a persistent tunnel that routes traffic between networks, not just individual devices.

Key benefits: Edge vpn apk download 2026

• Encrypts between sites so sensitive data never traverses the internet in plain text.
• Keeps the local networks separate and private, while allowing seamless inter-network access.
• Works well for branch offices, mergers, co-location, and remote backups.

Common terms you’ll see:

• IKE Internet Key Exchange: Phase 1 negotiation that sets up secure parameters.
• IPsec: The actual tunnel protocol that encrypts traffic.
• ESP Encapsulating Security Payload: The protocol that provides confidentiality and integrity inside IPsec.
• PSK pre-shared key vs certificates: authentication methods for IPsec peers.
• NAT-T NAT Traversal: allows IPsec to work when one or both endpoints sit behind NAT.

Prerequisites for Edgerouter site-to-site VPN

Before you start typing commands, gather these essentials:

• Two sites with public IP addresses. If one side is behind a NAT or uses a dynamic IP, plan for NAT-T and possibly dynamic DNS.
• Two LAN subnets that don’t overlap. Example: Site A 10.0.0.0/24, Site B 192.168.2.0/24.
• A shared pre-shared key PSK for IPsec authentication, or certificates if you opt for a certificate-based setup.
• Basic firewall control at both sites to allow IPsec-related traffic UDP 500, UDP 4500, and IPsec ESP.
• EdgeRouter devices at both sites running EdgeOS the EdgeRouter OS by Ubiquiti, typically EdgeRouter X/ER‑XX/ER‑4 series, etc..
• Optional: static routes to steer traffic for the remote LAN across the VPN.

Security tips to keep in mind:

• Use strong PSK random, long, unique to this tunnel. If you can, switch to certificate-based authentication for even stronger security, though it’s a bit more complex to manage.
• Use AES-256 and SHA-256 or better for encryption and integrity.
• Enable NAT-T if you expect NAT between sites or at least on the WAN connections.

Step-by-step setup guide EdgeOS

Note: EdgeRouter uses a CLI that resembles VyOS/EdgeOS syntax. The exact commands may vary slightly by firmware version, but the overall approach is the same: define IKE group, ESP group, create a site-to-site peer, and bind a tunnel with local/remote prefixes.

Scenario 1: Site A public IP 203.0.113.2, LAN 10.0.0.0/24 <-> Site B public IP 198.51.100.2, LAN 192.168.2.0/24
Scenario 2: Site B behind CGNAT or dynamic IP. NAT-T enabled and dynamic DNS setup. Edge router x vpn setup step-by-step guide for configuring IPsec/L2TP and OpenVPN on EdgeRouter X and compatible devices 2026

A. Define IKE and ESP groups common for both sites

• On Site A and Site B, configure consistent IKE/ESP groups.

  • IKE group
    • Name: IKE-GROUP1
    • lifetime: 3600
    • proposals: encryption AES256, hash SHA256, DH group 14 2048-bit
  • ESP group
    • Name: ESP-GROUP1
    • proposals: encryption AES256, hash SHA256

  Commands example. enter on Site A, and mirror on Site B with the peer IP swapped:

  • Set vpn ipsec ike-group IKE-GROUP1 lifetime 3600

  • Set vpn ipsec ike-group IKE-GROUP1 proposal 1 encryption aes256 Edge download android 2026

  • Set vpn ipsec ike-group IKE-GROUP1 proposal 1 hash sha256

  • Set vpn ipsec ike-group IKE-GROUP1 proposal 1 dh-group 14

  • Set vpn ipsec esp-group ESP-GROUP1 lifetime 3600

  • Set vpn ipsec esp-group ESP-GROUP1 proposal 1 encryption aes256

  • Set vpn ipsec esp-group ESP-GROUP1 proposal 1 hash sha256 Edge vpn app download 2026

B. Create the site-to-site peer IPsec tunnel partner

• On Site A public IP 203.0.113.2, peer Site B at 198.51.100.2

• On Site B public IP 198.51.100.2, peer Site A at 203.0.113.2

  Commands for Site A:

  • set vpn ipsec site-to-site peer 198.51.100.2 authentication mode pre-shared-secret
  • set vpn ipsec site-to-site peer 198.51.100.2 authentication pre-shared-secret ‘YourStrongPskHere’
  • set vpn ipsec site-to-site peer 198.51.100.2 ike-group IKE-GROUP1
  • set vpn ipsec site-to-site peer 198.51.100.2 esp-group ESP-GROUP1
  • set vpn ipsec site-to-site peer 198.51.100.2 local-address 203.0.113.2
  • set vpn ipsec site-to-site peer 198.51.100.2 tunnel 1 local prefix 10.0.0.0/24
  • set vpn ipsec site-to-site peer 198.51.100.2 tunnel 1 remote prefix 192.168.2.0/24
  • set vpn ipsec site-to-site peer 198.51.100.2 nat-traversal enable

  Commands for Site B mirror: Duolingo not working with vpn heres how to fix it 2026

  • set vpn ipsec site-to-site peer 203.0.113.2 authentication mode pre-shared-secret
  • set vpn ipsec site-to-site peer 203.0.113.2 authentication pre-shared-secret ‘YourStrongPskHere’
  • set vpn ipsec site-to-site peer 203.0.113.2 ike-group IKE-GROUP1
  • set vpn ipsec site-to-site peer 203.0.113.2 esp-group ESP-GROUP1
  • set vpn ipsec site-to-site peer 203.0.113.2 local-address 198.51.100.2
  • set vpn ipsec site-to-site peer 203.0.113.2 tunnel 1 local prefix 192.168.2.0/24
  • set vpn ipsec site-to-site peer 203.0.113.2 tunnel 1 remote prefix 10.0.0.0/24
  • set vpn ipsec site-to-site peer 203.0.113.2 nat-traversal enable

C. Firewall rules WAN side

• IPsec requires allowing ESP and NAT-T through the firewall on the WAN interface.

Example adjust per your firewall naming:

• set firewall name WAN_LOCAL rule 10 protocol esp
• set firewall name WAN_LOCAL rule 10 action accept
• set firewall name WAN_LOCAL rule 20 protocol udp
• set firewall name WAN_LOCAL rule 20 destination port 500
• set firewall name WAN_LOCAL rule 20 action accept
• set firewall name WAN_LOCAL rule 30 protocol udp
• set firewall name WAN_LOCAL rule 30 destination port 4500
• set firewall name WAN_LOCAL rule 30 action accept

D. NAT-T and automatic startup

• Ensure NAT-Traversal is enabled so IPsec can work when either side is behind NAT.

• You can also add a setting to automatically start the VPN on boot if your EdgeRouter is reloaded. Download f5 big ip edge vpn client for windows 10 and 11 2026

  Example:

  • set vpn ipsec options nat-traversal enable
  • commit
  • save

E. Commit, test, and verify

• Run:
• Then verify status:
  • show vpn ipsec sa
  • show vpn ipsec status
  • show vpn ipsec installedsa
• Ping tests:
  • From Site A, ping 192.168.2.1 a host on the remote LAN
  • From Site B, ping 10.0.0.1 a host on the local LAN at Site A
• If the tunnel shows as active, you should see a tunnel 1 association and data path.

F. Troubleshooting common issues

• The tunnel won’t come up:
  • Check PSK consistency on both sides. they must match exactly.
  • Confirm IKE-GROUP and ESP-GROUP match on both sides.
  • Verify local-address and remote-prefix values match the actual LANs.
  • Ensure the public IPs you used in the peer statements are correct.
  • Confirm firewall rules are not blocking UDP 500/4500 or ESP 50.
• The tunnel is up but traffic doesn’t route:
  • Check static routes on both sides and ensure they point to the VPN tunnel as the next hop for the remote LAN.
  • Confirm the VPN tunnel 1 local/remote prefixes don’t overlap and are correct.
  • Make sure there are no conflicting NAT rules that translate IPs for traffic going through the tunnel.
• NAT-T issues:
  • If either side is behind a firewall or gateway performing carrier-grade NAT, NAT-T is essential. ensure it’s enabled and that UDP 4500 is allowed through.
• Dynamic IP on one side:
  • Use a dynamic DNS update client on the side with the dynamic IP, and ensure the peer configuration is aware of the updated IP. NAT-T helps with NAT scenarios.

G. Multi-site and scaling tips

• For more than two sites, keep a consistent IKE/ESP policy across all peers to avoid mismatches and to simplify management.
• If you’re expanding, consider central site-to-site hub and spoke or fully meshed topology depending on traffic patterns.
• Maintain a simple naming convention for peers and tunnels to reduce confusion as the network grows.

H. Security and maintenance recommendations Does youtube detect vpns and how to watch without issues in 2026

• Regularly rotate PSKs or deploy certificates for authentication if you’re comfortable with PKI management.
• Monitor VPN status periodically and set up alerts if a tunnel goes down for a specified period.
• Consider enabling dead peer detection DPD if your EdgeRouter firmware supports it, to quickly detect an unreachable peer.

Real-world example configuration scenario-based

To give you a practical feel, here’s a compact, ready-to-use example you can adapt. This uses a simple PSK and a single tunnel, with both sites configured similarly.

Site A public IP 203.0.113.2, LAN 10.0.0.0/24 to Site B public IP 198.51.100.2, LAN 192.168.2.0/24

• Define groups

• Site-to-site peer

• Firewall examples WAN_LOCAL Does vpn pro actually work my honest look at vpn pro performance and reliability for streaming privacy and speed 2026

  • set firewall name WAN_LOCAL rule 10 protocol esp
  • set firewall name WAN_LOCAL rule 10 action accept
  • set firewall name WAN_LOCAL rule 20 protocol udp
  • set firewall name WAN_LOCAL rule 20 destination port 500
  • set firewall name WAN_LOCAL rule 20 action accept
  • set firewall name WAN_LOCAL rule 30 protocol udp
  • set firewall name WAN_LOCAL rule 30 destination port 4500
  • set firewall name WAN_LOCAL rule 30 action accept

• Commit and verify

If you ever need to adjust because one side has a dynamic IP, keep NAT-T enabled and consider pairing with a dynamic DNS service, so the peer can resolve the current public IP without manual updates.

Frequently Asked Questions

What is Edgerouter vpn site to site?

What hardware do I need to set this up?

You’ll need two EdgeRouter devices any current EdgeRouter running EdgeOS, two public IP addresses or a combination of NAT and dynamic DNS on one side, and two LAN subnets that don’t overlap.

Do I need certificates for IPsec on EdgeRouter?

Not strictly. You can use a pre-shared key PSK for authentication, which is simpler to set up. For stronger security in larger deployments, certificates can be used, but they require a PKI setup and management.

Can EdgeRouter do IKEv2, or is it only IKEv1?

EdgeRouter supports IKEv1 and IKEv2 depending on firmware and settings. AES256 + SHA256 and a modern DH group like 14 are recommended for IKEv2-like strength on modern devices.

How do I configure the PSK securely?

Choose a long, random string that isn’t reused elsewhere. Don’t use something simple or guessable. Rotate PSKs periodically as part of your security hygiene.

How do I know the VPN tunnel is actually working?

You’ll see the IPsec SA Security Association entries when you run show vpn ipsec sa or show vpn ipsec status. You should also be able to ping hosts across the tunnel e.g., ping remote LAN devices once routes are correctly configured.

What if one site has a dynamic IP?

Enable NAT-T and, if possible, pair with a dynamic DNS service on the side that changes IP. Mirror DNS updates on the other side so the tunnel can still be established.

How can I test performance over the VPN?

Use iperf or similar network performance tools to test throughput between hosts on opposite LANs. Also test latency by pinging across the tunnel under normal load and during peak hours.

How do I add a second VPN site without breaking the first?

Keep the IKE and ESP parameters consistent and add a separate site-to-site peer with its own tunnel 1 or tunnel 2 if you want to separate. Maintain unique local/remote prefixes for each site to avoid routing confusion.

Can I have more than one tunnel per site?

Yes. You can configure multiple IPsec site-to-site peers on the same EdgeRouter. Each peer will have its own tunnel and can use distinct local/remote prefixes. Just ensure there are no overlapping subnets and that routing is clearly defined.

How do I route traffic through the VPN?

Use static routes on each site that point to the remote LAN subnet via the VPN tunnel. For example, on Site A, route 192.168.2.0/24 via tunnel 1, and on Site B, route 10.0.0.0/24 via tunnel 1.

What are the most common mistakes?

• Mismatched PSK, IKE group, or ESP group between peers
• Subnets that overlap or are misconfigured in the tunnel definitions
• Firewall blocks on UDP 500/4500 or ESP protocol 50
• Forgetting to commit and save changes after editing EdgeOS configuration

Is it better to use certificates for a long-term site-to-site VPN?

Certificates provide stronger and scalable authentication for multiple peers, especially in larger deployments. PSK is easier to set up for a small number of sites but rotating PSKs in many sites becomes harder over time.

Closing notes

Edgerouter vpn site to site can be surprisingly straightforward once you align the peers, subnets, and firewall rules. With the right IKE/ESP settings, NAT-T, and clean routing, you’ll have a robust, low-latency tunnel between sites that behaves like a single extended network. If you’re new to EdgeRouter, give yourself a little time to practice commands in a test environment before touching production networks. And if you want to explore additional protection, don’t forget to check the NordVPN offer linked above.

If you need a quick reference, I’ve included the essential commands and structure above, plus practical tips for common edge cases like NAT behind one side or dynamic IP setups. Happy tunneling!

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