====== IPSec ======
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# Site To Site VPN
1. [pfSense](technical:ipsec:pfsense)
2. [RouterOS](technical:ipsec:routeros)
3. [Linux Strongswan](technical:ipsec:strongswan)

# Tunnels
1. [NetworkManager L2TP](technical:ipsec:nm-l2tp)
2. [xl2tpd](technical:ipsec:xl2tpd)
3. [Connman](technical:ipsec:connman-l2tp)
4. [Systemd-networkd](technical:ipsec:systemd-networkd-l2tp)
5. [Iproute2 GRE](technical:ipsec:iproute2-gre)

# Links
- https://www.strongswan.org/

- https://openswan.org/

- https://libreswan.org/

- https://www.freeswan.org/

- https://github.com/nm-l2tp/NetworkManager-l2tp

- https://manpages.debian.org/unstable/connman/connman-vpn-provider.config.5.en.html

- https://github.com/xelerance/xl2tpd

- https://github.com/systemd/systemd/pull/11908

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

- https://www.kernel.org/doc/html/latest/networking/l2tp.html

- https://tldp.org/HOWTO/Leased-Line/pppd.html

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