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IPSec

Linux

1. Strongswan
2. Openswan
3. Libreswan
4. NetworkManager L2TP

• https://www.strongswan.org/
• https://openswan.org/

• https://libreswan.org/

• https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/securing_networks/configuring-a-vpn-with-ipsec_securing-networks

Cisco

• https://www.cisco.com/c/en/us/support/docs/ip/internet-key-exchange-ike/117258-config-l2l.html