Install ipsec-tools by entering the following commands in the terminal:
sudo apt update sudo apt install ipsec-tools
Description:
IPsec utilities
IPsec (Internet Protocol security) offers end-to-end security for network traffic at the IP layer. . This package is a Linux port of the utilities from the KAME IPsec implementation on BSD.
Homepage: http://ipsec-tools.sourceforge.net/
Version: 1:0.8.2+20140711-10build1
Section: universe/net