There might be situations where you would want to use Linux as a client to connect to an L2TP/IPsec VPN server such as Windows 2000/2003, a Cisco VPN server or Mac OS X Server. First try to figure if you really need to use L2TP/IPsec. Can you use pure IPsec instead? IPsec without L2TP is much easier to use for Linux …

vpnc - CISCO VPN configuration steps - Ask Ubuntu Admin can get pcf file which are already connected with Windows systems in Cisco VPN clients from Cisco Box administrators. Self creating files may waste your time due to typo errors etc. pcf2vpnc utility in Linux will automatically convert file in Linux conf format. vpn ipsec amd linux client - Cisco Community I have confugured IPSEC VPN server on Cisco 7200 and both Windows and Linux clients (with Cisco VPN client) are able to connect and everything works perfectely. But when I configure feature "group-lock" under "crypto isakmp client configuration group" then only Windows clients are still able to connect and Linux connections are refused. How to install ocserv ssl vpn server on CentOS 7 linux Sep 29, 2019 Article - VPN - Setup for Linux

Cisco's debug command can be used to monitor the VPN tunnel establishment in detail. debug crypto isakmp debug crypto ipsec show log. An example debug of a succesfully established connection is here. Good housekeeping settings (enable SSH, no CDP, set Logging) are here. Configuring the Linux FreeSwan VPN

Mar 10, 2015 How to Connect to L2TP/IPsec VPN on Linux

Site To Site VPN Routing Explained In Detail | OpenVPN

Connect Linux to CU VPN | IT@Cornell Jun 15, 2020 Cisco AnyConnect VPN with openvpn & openconnect – Tuxdiary Sep 04, 2014 Sharing Cisco VPN connection with network peers - Server Fault