Site-to-Site VPN Setup

Site-to-Site VPN Setup

Site-to-Site VPN Planning

Site-to-site VPNs securely connect multiple office locations over the internet, creating a unified private network. Proper planning includes bandwidth assessment, redundancy requirements, routing design, and security policy definition.

VPN Connection

IPSec Configuration

IPSec site-to-site VPNs require configuration of IKE Phase 1 (ISAKMP) parameters including authentication method, encryption algorithm, and Diffie-Hellman group, followed by IKE Phase 2 (IPSec) settings for data encryption and integrity.

Routing Considerations

Site-to-site VPNs can use static routing for simple topologies or dynamic routing protocols like OSPF or BGP for complex multi-site deployments. Proper route summarization and failover configuration ensure optimal traffic flow and resilience.

High Availability

Implement VPN redundancy using backup tunnels, multiple internet connections, and failover mechanisms. Active-active or active-passive configurations ensure business continuity during link failures or device outages.

Monitoring and Troubleshooting

Continuous monitoring of VPN tunnel status, throughput, latency, and packet loss enables proactive issue detection. Common troubleshooting involves verifying phase 1/2 parameters, checking ACLs, validating routing, and analyzing logs.

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