Edgerouter vpn site to site: complete guide to setting up a secure IPsec site-to-site VPN on EdgeRouter devices, topology options, step-by-step configuration, troubleshooting, and best practices

Edgerouter vpn site to site is a way to securely connect two networks over the internet using IPsec on EdgeRouter devices. In this guide, you’ll get a practical, end-to-end view: from topology choices and planning to a clear step-by-step EdgeRouter configuration, verification commands, and common gotchas. We’ll also cover interoperability with other vendors, security considerations, and ways to monitor and maintain your tunnels over time. If you’re looking to harden your network while keeping things maintainable, this article is for you. And if you want a quick personal protection boost alongside your site-to-site setup, check this NordVPN deal:

Useful resources unlinked in the article: EdgeRouter Documentation – help.ubiquiti.com, IPsec overview – en.wikipedia.org/wiki/IPsec, Ubiquiti EdgeOS firewall and routing basics – help.ubiquiti.com, VPN interoperability guidelines – cisco.com, Open Standards for IPsec – www.ietf.org

Introduction summary: what you’ll learn
– Understand how IPsec site-to-site VPNs work on EdgeRouter devices
– Compare hub-and-spoke versus full-mmesh mesh topologies and decide what fits your network
– Step-by-step EdgeRouter configuration for a typical two-site setup
– How to verify tunnels, test connectivity, and troubleshoot common issues
– Security best practices: encryption, hashing, DH groups, NAT traversal, and key management
– Interoperability tips when connecting EdgeRouter to other vendors Cisco, Fortinet, pfSense, Juniper

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

Site-to-site VPN on EdgeRouter devices is a permanent, encrypted tunnel between two networks over the public internet. It uses IPsec to protect data in transit, and it typically handles traffic between internal subnets for example, 192.168.10.0/24 at site A and 192.168.20.0/24 at site B. Unlike remote-access VPNs that secure individual devices, a site-to-site VPN creates a private tunnel for entire networks, which simplifies routing and tends to improve performance for inter-site traffic.

EdgeRouter gear from small to enterprise-friendly models runs EdgeOS, which includes a dedicated IPsec stack. You’ll define:

• Phase 1 IKE settings: how peers authenticate and establish the tunnel
• Phase 2 IPsec settings: how traffic gets encrypted and decrypted
• Local and remote subnets: which networks are protected through the tunnel
• Firewall rules and NAT handling to ensure IPsec traffic is allowed and routed correctly

A well-planned EdgeRouter site-to-site VPN can scale to multiple tunnels multi-site, but planning is key to avoid overlapping subnets and routing loops.

Why EdgeRouter for site-to-site VPN?

• Cost-effective, capable hardware: EdgeRouter devices offer strong routing features at a reasonable price point
• Flexible EdgeOS CLI and GUI: You can configure IPsec via the Web UI or CLI, depending on preference
• Good performance with AES/NIST-approved ciphers: With modern EdgeRouter models, you can use AES-256, SHA-256, and strong DH groups
• Interoperability: IPsec is a standard, so you can connect EdgeRouter to other vendors’ devices Cisco ASA/ISR, Fortinet, pfSense, Juniper, etc.
• Centralized security posture: When you pair site-to-site with strong user- and device-level security, you get an overall safer network

Keep in mind that actual throughput and performance depend on your EdgeRouter model, firmware version, and the complexity of your tunnels number of tunnels, encryption settings, and routing rules. In practice, you’ll usually find EdgeRouter devices capable of handling multiple IPsec tunnels without contention in small-to-medium setups.

Topologies: hub-and-spoke vs full mesh

• Hub-and-spoke star: A central site hub has IPsec tunnels to several remote sites spokes. All inter-site traffic between spokes passes through the hub unless you implement direct tunnels between spokes. This is simple to manage but can add latency and a single point of failure risk if the hub goes down.
• Full mesh mMultipoint: Each site has a direct IPsec tunnel to every other site. This reduces latency for inter-site traffic but requires more tunnels and more configuration. It scales best for a few sites but becomes complex as the network grows.
• Partial mesh: A hybrid approach where some sites are directly connected while others route through a designated hub or via a subset of tunnels.

Tips: Edgerouter x sfp vpn setup

• Start with hub-and-spoke if you’re new to IPsec on EdgeRouter. upgrade to mesh as you add sites and traffic patterns justify it.
• Plan subnets carefully to avoid overlap. IP address planning is critical when you run multiple sites with IPsec.

Planning and prerequisites

• Public IPs or dynamic DNS: Each site needs a reachable public IP or a dynamic DNS name with a dynamic DNS service
• Subnet planning: Choose non-overlapping local subnets for each site for example, Site A: 192.168.10.0/24, Site B: 192.168.20.0/24
• Internet connectivity: Ensure reliable upstream connectivity. IPsec requires stable ICMP for troubleshooting and keepalives
• Firewall readiness: You’ll need to permit IPsec-related traffic IKE 500/4500 via UDP, ESP protocol
• Time synchronization: NTP in both sites helps with certificate-based auth where applicable and logs
• Firmware awareness: Use recent EdgeOS versions. IPsec improvements and bug fixes pop up in new releases
• PSK vs certs: PSK pre-shared key is simpler for two sites, cert-based authentication is better for many sites or large deployments

Encryption and security choices

• IKE version: IKEv1 is widely supported. IKEv2 is more modern and handles mobility/renegotiation better. If both sides support IKEv2, it’s often the better choice.

• Encryption: AES-256 is a strong default. AES-128 is faster but slightly less secure. For most sites, AES-256 is preferred.

• Hashing: SHA-256 or SHA-384 are common choices. avoid older SHA-1 when possible.

• DH group: Use at least Group 14 2048-bit or better. higher groups provide stronger forward secrecy but can add CPU load.

• Perfect Forward Secrecy PFS: Enable PFS for phase 2 to ensure session keys are not reused. typically you’ll see a DH group chosen again e.g., Group 14 for Phase 2 What is ghost vpn and how it works for online privacy and security in 2025

• NAT traversal: NAT-T UDP 4500 is often required when either end is behind NAT. this is a typical default

• Dead Peer Detection DPD: Enable to detect dead peers quickly and re-establish tunnels when peers go offline

• Lifetime: Phase 1 often 8-12 hours 28800-43200 seconds and Phase 2 typically 3600-14400 seconds. adjust to fit your policy and device capabilities

• Don’t reuse the exact same PSK across many peers. rotate keys periodically

• When interconnecting with non-EdgeRouter devices, verify the other device’s recommended IKE/ESP proposals and adjust yours accordingly Edgerouter x vpn client guide for EdgeRouter X: configuring IPsec/L2TP, split tunneling, and performance tips

• If you have dynamic IPs, consider using a dynamic DNS service and update your peer config when IPs change

Interoperability with other devices

• Cisco ASA/ISR: IPsec is standard. align IKE and ESP proposals with the Cisco device. ensure phase 1 and phase 2 proposals match
• Fortinet FortiGate: Similar to Cisco. confirm NAT-T, IKEv2 if used, and proper subnets
• pfSense: pfSense and EdgeRouter both support IPsec. you’ll map phase 1/2 parameters and the tunnels accordingly
• Juniper: IPsec on EdgeRouter can interoperate via standard ESP/IKE, but verify the exact proposals

Pro-tip: When starting a new site-to-site VPN between EdgeRouter and another vendor, begin with a tight security policy AES-256, SHA-256, DH Group 14 and then loosen or adjust as necessary after testing.

Step-by-step: configuring a site-to-site VPN on EdgeRouter two-site example

Note: The exact commands may vary slightly by EdgeOS version. The following provides a practical, representative approach. Replace IPs and subnets with your own values.

Assumptions:

• Site A: Local LAN 192.168.10.0/24, Public IP 203.0.113.10
• Site B: Local LAN 192.168.20.0/24, Public IP 203.0.113.20
• PSK: “yourP@ssw0rd”
• Interfaces: eth0 is the WAN, eth1 is the LAN on both sites
• We’ll configure IKE Group 0 with AES-256, SHA-256, DH Group 14

EdgeRouter A Site A Is pia vpn free and what you need to know about Private Internet Access pricing, free options, trials, and value

1. Configure IKE and ESP groups
   set vpn ipsec ike-group IKE-GROUP0 proposal 1 encryption aes256
   set vpn ipsec ike-group IKE-GROUP0 proposal 1 hash sha256
   set vpn ipsec ike-group IKE-GROUP0 proposal 1 dh-group 14
   set vpn ipsec ike-group IKE-GROUP0 lifetime 3600

set vpn ipsec esp-group ESP-GROUP0 proposal 1 encryption aes256
set vpn ipsec esp-group ESP-GROUP0 proposal 1 hash sha256
set vpn ipsec esp-group ESP-GROUP0 lifetime 3600

2. Define the site-to-site peer
   set vpn ipsec site-to-site peer 203.0.113.20 authentication mode pre-shared-secret
   set vpn ipsec site-to-site peer 203.0.113.20 authentication pre-shared-secret ‘yourP@ssw0rd’
   set vpn ipsec site-to-site peer 203.0.113.20 ike-group IKE-GROUP0
   set vpn ipsec site-to-site peer 203.0.113.20 default-esp-group ESP-GROUP0
   set vpn ipsec site-to-site peer 203.0.113.20 tunnel 1 local-subnet 192.168.10.0/24
   set vpn ipsec site-to-site peer 203.0.113.20 tunnel 1 remote-subnet 192.168.20.0/24

3. Ensure the tunnels are activated on startup
   set vpn ipsec auto-firewall-nat-excluded enable

4. Firewall considerations allow IPsec traffic
   set firewall name WAN_LOCAL rule 10 action accept
   set firewall name WAN_LOCAL rule 10 protocol udp
   set firewall name WAN_LOCAL rule 10 destination-port 500
   set firewall name WAN_LOCAL rule 10 description ‘IKE UDP 500’

set firewall name WAN_LOCAL rule 11 action accept
set firewall name WAN_LOCAL rule 11 protocol udp
set firewall name WAN_LOCAL rule 11 destination-port 4500
set firewall name WAN_LOCAL rule 11 description ‘NAT-T UDP 4500’ Veepn for microsoft edge: Veepn edge extension setup, features, and tips for using Veepn on Microsoft Edge

set firewall name WAN_LOCAL rule 12 action accept
set firewall name WAN_LOCAL rule 12 protocol esp
set firewall name WAN_LOCAL rule 12 description ‘IPsec ESP’

5. Add static routes or adjust routing so traffic between subnets goes through the VPN
   set protocols static route 192.168.20.0/24 next-hop 192.168.10.1
   Note: Depending on your topology, you may need to use policy-based routing instead of a static route or rely on the VPN interface for inter-subnet traffic.

6. Commit and save
   commit
   save

EdgeRouter B Site B

Use mirrored values from Site A, just swap subnets and public IPs: F5 vpn client version

1. IKE/ESP groups same as Site A

2. Peer configuration for Site A
   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 ‘yourP@ssw0rd’
   set vpn ipsec site-to-site peer 203.0.113.10 ike-group IKE-GROUP0
   set vpn ipsec site-to-site peer 203.0.113.10 default-esp-group ESP-GROUP0
   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

3. Firewall considerations allow IPsec traffic

4. Routing
   set protocols static route 192.168.10.0/24 next-hop 192.168.20.1

Notes: Microsoft edge secure network vpn review

• If you’re using a different topology for example hub-and-spoke, you’ll adjust the remote-subnet values and the static routes accordingly.
• On some EdgeRouter firmware versions, you may configure tunnels with a “tunnel” stanza by number 1, 2, etc. Make sure to align tunnel numbers on both ends.
• If you’re deploying multiple tunnels, consider using separate IKE/ESP groups per tunnel to isolate security contexts.

Verification, testing, and troubleshooting

Verification steps:

• Check the tunnel status:
  • show vpn ipsec sa
  • show vpn ipsec status
• Ping tests across subnets:
  • From Site A: ping 192.168.20.1 or a host in 192.168.20.0/24
  • From Site B: ping 192.168.10.1 or a host in 192.168.10.0/24
• Traceroute to ensure traffic passes through the VPN

Common issues and fixes:

• Mismatched IKE/ESP proposals: Ensure both sides use compatible encryption, hash algorithms, and DH groups
• Incorrect local/remote subnets: Confirm subnets do not overlap and match what each side expects
• PSK mismatch: Reconfirm the pre-shared key. a typo here is a frequent failure
• NAT-T and firewall rules: Ensure UDP 500/4500 and ESP are allowed on WAN interfaces. NAT can interfere if not properly accounted for
• Routing errors: If traffic does not reach the remote LAN, verify that static routes or policy routing are targeting the VPN tunnel
• Dynamic IP address changes: If you have changing public IPs, you’ll need dynamic DNS on both ends or scripts to update peers when IPs change

Troubleshooting tips:

• Use logs: examine EdgeRouter logs for IPsec events
• Reboot only if necessary: a soft reload of VPN settings can fix state issues without rebooting
• Test with endpoints inside subnets: ensure internal firewall rules allow traffic between subnets and the VPN tunnel
• Confirm MTU and fragmentation: IPv6 and VPN traffic can hit MTU issues. adjust MSS if required

Code blocks: sample verification commands

show vpn ipsec sa
show vpn ipsec status
ping 192.168.20.1 source 192.168.10.10
traceroute 192.168.20.1


 Security best practices and maintenance

- Regularly update firmware: EdgeRouter firmware updates often include IPsec improvements and security fixes
- Rotate pre-shared keys: Schedule periodic PSK changes and document the changes securely
- Prefer IPsec with IKEv2 if available: It tends to be more robust for roaming clients and renegotiation
- Use strong ciphers: AES-256, SHA-256, and DH Group 14 or higher
- Limit tunnel exposure: Only allow necessary inbound/outbound traffic. keep administration interfaces locked down
- Consider certificates for large deployments: If you’re managing many sites, certificate-based authentication reduces PSK distribution risks
- Backups: Regularly export and store a backup of your EdgeRouter configuration. test restoring it in a lab environment

Performance considerations:
- The CPU matters: The throughput of IPsec is CPU-bound. EdgeRouter models with more powerful CPUs will handle more tunnels and higher throughput
- Avoid overly aggressive logging in production: Logging IPsec events is useful but can impact performance if done excessively
- Monitor health: Regularly check tunnel status and internet connectivity to ensure reliability


 FAQ: Frequently Asked Questions

# What is a site-to-site VPN?
A site-to-site VPN connects two or more networks over the internet using IPsec to create a secure tunnel so devices on one network can communicate with devices on the other as if they were on the same local network.

# Can I use a site-to-site VPN with EdgeRouter and another vendor?
Yes. IPsec is a standard protocol suite, so EdgeRouter can connect with Cisco, Fortinet, Juniper, pfSense, and other IPsec-enabled devices as long as the proposals encryption, hashing, DH group and networking are aligned.

# Should I use IKEv1 or IKEv2 on EdgeRouter?
IKEv2 is generally preferred for new deployments due to better renegotiation, faster reconnects, and improved reliability in dynamic environments. If both ends support IKEv2, use it.

# How do I avoid overlapping subnets?
Plan your network addressing before building tunnels. Maintain unique, non-overlapping subnets for each site e.g., Site A 192.168.10.0/24, Site B 192.168.20.0/24. If you already have overlapping ranges, consider readdressing or using NAT to isolate traffic.

# What should I do if the tunnel shows as up but no traffic passes?
Check firewall rules, verify the remote-subnet definitions, and confirm that static or policy routes point to the VPN interface. Also verify that there are no NAT rules inadvertently translating VPN traffic.

# How do I test IPsec tunnels?
Use commands to view tunnel status, ping hosts across the tunnel, and trace the path. Look for ISAKMP/IKE and ESP status in EdgeRouter’s VPN status, and test both directions.

# Do I need NAT-T?
If either side is behind NAT, NAT-T UDP 4500 is usually required. If both sides have public IPs, NAT-T may not be necessary, but enabling it is common practice to minimize issues.

# How do I know which encryption settings to choose?
Start with AES-256, SHA-256, and DH group 14 as a baseline. Then adjust based on performance and compatibility with the other device.

# Can I run more than one VPN tunnel on a single EdgeRouter?
Yes, many EdgeRouter models can handle multiple IPsec tunnels. Plan resource usage and ensure firewall and routing rules scale accordingly.

# How do I secure and manage multiple sites at scale?
For many sites, consider certificate-based authentication, a scalable routing policy, centralized monitoring, and a structured change-management process. A hub-and-spoke topology can simplify management, while direct site-to-site tunnels may reduce latency for critical links.


 Resources and references for further reading

- EdgeRouter Documentation - help.ubiquiti.com
- IPsec overview - en.wikipedia.org/wiki/IPsec
- Ubiquiti EdgeOS firewall and routing basics - help.ubiquiti.com
- VPN interoperability guidelines - cisco.com
- Open Standards for IPsec - www.ietf.org

Note: The content above is designed to be a practical, human-friendly guide for setting up Edgerouter site-to-site VPNs. Adjust values to fit your specific network design and security requirements. If you’re expanding to multi-site deployments, consider staged rollouts and testing with one tunnel before adding more sites.

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