Howto set up a L2TP/IPsec VPN Dial-In Server (Part I to III) | The FreeBSD Forums
GitHub - opencoff/ipsec-tools: Mirror/fork of sourceforge ipsec-tools
Zeek: Zeek's IPSec Protocol Analyzer
IPSec Configuration : Sippy Software, Inc.
Checking the tunnel setup
NAT with IPsec on 2.6 kernel
networking - Sharppcap how to send packets using the route in ubuntu? - Stack Overflow
OpenWrt Wiki] IPsec site-to-site
IPsec Tools of the Trade: Don't Bring a Knife to a Gunfight « Null Byte :: WonderHowTo
Mustafa Al-Bassam on Twitter: "The history of IPSec VPNs is littered with remote code execution vulnerabilities for over a decade. If you use IPSec, assume you're pwned." / Twitter
IPsec Tools of the Trade: Don't Bring a Knife to a Gunfight « Null Byte :: WonderHowTo
IPsec-Tools Alternatives: Top 3 VPN Services and similar apps | AlternativeTo
ipsec-tools | Linux Explore
GitHub - Distrotech/ipsec-tools
openSUSE Software
IPsec VPNs: What They Are and How to Set Them Up | Twingate
GitHub - kingcody/IPSec-Tools: NodeJS tools/bindings for managing IPSec VPNs