Successfully Configuring a Site-to-Site VPN on a SonicWall Router

A site-to-site VPN ensures secure communication between remote networks by creating an encrypted tunnel. Below is a detailed guide for configuring a SonicWall router in a lab environment, including essential commands and verification steps.

Step-by-Step Configuration

1. Access SonicWall Management Interface

• Open a browser and navigate to `https://` (default: 192.168.168.168).
• Log in with admin credentials.

2. Configure VPN Policies

• Navigate to VPN > Settings and enable Site-to-Site VPN.
• Click Add to create a new policy.

3. Define Network Parameters

• General Tab:
• Set Authentication Method to IKE using Pre-Shared Secret.
• Enter a shared secret key.
• Network Tab:
• Local Network: `LAN Subnet` (e.g., 192.168.1.0/24).
• Remote Network: Destination subnet (e.g., 10.0.0.0/24).

4. IPSec Policies

• Under VPN > IPSec, configure:
• Phase 1:
• Encryption: `AES-256`
• Authentication: `SHA-256`
• DH Group: `Group 14`
• Phase 2:
• Protocol: `ESP`
• Encryption: `AES-128`

5. Apply and Test Connectivity

• Save settings and initiate the VPN tunnel.
• Verify with:

  ping <Remote_Network_Gateway> 
  

• Check logs in Log > VPN for errors.

You Should Know: Essential VPN Verification Commands

• Linux:

  ip tunnel show  List active VPN tunnels 
  ipsec status  Check IPSec status (StrongSwan/Libreswan) 
  tcpdump -i eth0 esp  Capture VPN traffic 
  

• Windows:

  Get-NetIPsecRule  View IPsec policies 
  Test-NetConnection <Remote_IP> -Port 500  Check IKE connectivity 
  

• SonicWall CLI:

  show vpn status  Display VPN tunnel status 
  show vpn stats  Traffic statistics 
  

What Undercode Say

A properly configured site-to-site VPN ensures data integrity and confidentiality. For advanced security:
– Rotate pre-shared keys periodically.
– Use certificate-based authentication for higher security.
– Monitor VPN logs for intrusion attempts:

grep "IPSec" /var/log/syslog  Linux log inspection 

– For troubleshooting, verify firewall rules:

iptables -L -v -n | grep IPSec  Check Linux firewall rules 

Expected Output:

• A stable VPN tunnel with encrypted traffic between subnets.
• Logs confirming successful Phase 1 and Phase 2 negotiations.
• Ping and traceroute tests validating end-to-end connectivity.

Reference:

SonicWall VPN Configuration Guide

References:

Reported By: Shamseer Siddiqui – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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