Enterprise-Grade IPsec Configuration & Tunnel Management

IKEv2 is the modern replacement for IKEv1, offering faster negotiation (fewer message exchanges), built-in NAT traversal, MOBIKE support for mobile clients, improved reliability with built-in Dead Peer Detection, and stronger cryptographic algorithms. We strongly recommend IKEv2 for all new deployments.

We support and recommend AES-256-GCM for encryption, SHA-256/SHA-384/SHA-512 for integrity, and DH Group 14 (2048-bit), Group 19 (256-bit ECC), Group 20 (384-bit ECC), or Group 21 for key exchange. We actively remove weak ciphers like DES, 3DES, MD5, and DH Groups 1/2/5 from all configurations.

In tunnel mode (most common), the entire original IP packet is encrypted and encapsulated inside a new IP packet — ideal for site-to-site VPNs between gateways. In transport mode, only the payload is encrypted while the original IP header remains intact — used for host-to-host encryption within a trusted network.

PFS ensures that each session uses a unique ephemeral key derived through a new Diffie-Hellman exchange. This means that if a session key is ever compromised, it cannot be used to decrypt past or future sessions. PFS adds significant cryptographic resilience and is mandatory in our standard IPsec deployments.

Yes. IPsec supports NAT traversal (NAT-T) which encapsulates ESP packets inside UDP port 4500 to pass through NAT devices. We configure NAT-T automatically when NAT is detected and ensure UDP 500 and 4500 are permitted through all intermediate firewalls.

Site-to-site IPsec setup involves defining IKE Phase 1 (ISAKMP) policies, Phase 2 (IPsec) transform sets, crypto maps or VTIs, and interesting traffic ACLs. We handle end-to-end configuration on both peers, validate connectivity with debug outputs and ping tests, and document the final configuration for your records.

AH (Authentication Header) provides integrity and authentication but no encryption — it is incompatible with NAT. ESP (Encapsulating Security Payload) provides both encryption and optional authentication, and supports NAT traversal. We use ESP exclusively in all modern deployments as it provides complete security while working through NAT.

IPsec troubleshooting follows a systematic process: verify IKE Phase 1 completion using show crypto isakmp sa, check Phase 2 via show crypto ipsec sa, review debug logs for negotiation mismatches, check routing and ACLs for interesting traffic, and verify firewall policies permit UDP 500/4500 and ESP (protocol 50).

Our engineers are certified across Cisco IOS/IOS-XE/ASA/FTD, Juniper SRX/MX, Palo Alto Networks, Fortinet FortiGate, Check Point, pfSense/OPNsense, and major cloud platforms including AWS Site-to-Site VPN, Azure VPN Gateway, and GCP Cloud VPN. We handle interoperability configurations between different vendors.

Best practice for IKE SA (Phase 1) lifetime is 86,400 seconds (24 hours), and for IPsec SA (Phase 2) lifetime is 3,600 seconds (1 hour) or 50–100 MB of data transferred. With PFS enabled, each renegotiation uses a fresh DH exchange, making the effective key lifetime very short regardless of the configured timer.

Yes. We integrate IPsec tunnels directly into your existing firewall infrastructure, configuring crypto maps or VTI interfaces as appropriate. We also configure the necessary zone-based policies, security groups, and route statements to ensure interesting traffic is correctly identified and encrypted end-to-end.

When properly configured, IPsec satisfies encryption-in-transit requirements under PCI-DSS (Requirement 4), ISO/IEC 27001 (Annex A.10), and NIST SP 800-77. We document all cipher selections, key management procedures, and tunnel configurations in a format suitable for audit submission.

Click "Get Instant Pricing" to submit your requirements — number of sites, existing hardware, and cloud platforms. Our team will provide a same-day quote and schedule a discovery call to review your current topology. For most standard site-to-site deployments we can complete configuration and testing within 24–48 hours.