11/2/2023 0 Comments Vpn gate client linuxEither the client reaches Internet across a NAT router or the VPN server has a private IP address, the IPSec protocol has some authentication problems due to the fact that, the NAT Gateway alters the IP headers.The L2TP/IPSec VPN clients are not easily configurable also in the case in which the Operating System includes native support for such type of VPN.This double authentication, in some cases, could be considered a time waster, specially when the certificate is stored on a Smart Card and to unlock the private key, the PIN code is already needed After the X.509 authentication, it is not possible to avoid the second authentication with username and password.Zeroshell has the X.509 Certification Authority module, but in any case, its management could take too time for some organizations This problem can be resolved building a PKI (Public Key Infrastructure) to sign and manage X.509 certificates. It is not possible to avoid deploying a X.509 certificate and the related private key to any VPN client. ![]() Many of the issues of L2TP/IPSec, which have been solved by using OpenVPN, are listed below: This combination of tunnels, the first (IPSec) authenticated by the IKE with X.509 certificates and the second (L2TP) authenticated with username and password credentials against the local Kerberos 5 KDC, has showed its limits soon. However, only the L2TP/IPSec VPNs were supported. Zeroshell was able to act as VPN gateway for the Host-to-LAN connections already starting with its first release. ![]() OpenVPN authentication with X.509 digital certificates.OpenVPN authentication with Username and Password.Default configuration for VPN Host-to-LAN with OpenVPN.The sections in which the how-to is divided are the followings: ![]() The purpose of this document is to describe how to configure an OpenVPN Gateway for the Host-to-LAN Virtual Private Network.
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