How to configure a Linux firewall to masquerade IPsec- and PPTP-based Virtual Private Network traffic, allowing you to establish a VPN connection without losing the security and flexibility of your Linux firewall's internet connection and allowing you to make available a VPN server that does not have
IPsec HOWTO Ralf Spenneberg ralf (at) spenneberg.net This HowTo will cover the basic and advanced steps setting up a VPN using IPsec based on the Linux Kernels 2.4 and 2.5/2.6. Since there is a vast amount of documentation available for the Linux Kernel 2.4, this HowTo will concentrate on the new IPsec Features in the development Kernel rst. Creating VPNs with IPsec and SSL/TLS | Linux Journal Jan 01, 2008 Connect on-premises network to Azure virtual network: Site A Site-to-Site VPN gateway connection is used to connect your on-premises network to an Azure virtual network over an IPsec/IKE (IKEv1 or IKEv2) VPN tunnel. This type of connection requires a VPN device located on-premises that has an externally facing public IP address assigned to it. For more information about VPN gateways, see About VPN gateway.
13. Restart ipsec and xl2tpd: (starting ipsec and xl2tpd ) Type /usr/sbin/ipsec start and tap Enter key. 14. Type /etc/init.d/xl2tpd start and tap on the Enter key. 15. You are now ready to start using VPN. Startup sequence: (starting VPN connection ) ipsec up L2TP-PSK
On Linux, you could use a command such as this to NAT the VPN client traffic to the internet: iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE. This command assumes that the VPN subnet is 10.8.0.0/24 (taken from the server directive in the OpenVPN server configuration) and that the local ethernet interface is eth0.
First, you need to configure the kernel to enable packet forwarding by adding the appropriate system …
a patch to make IPsec, PPTP and SSH VPNs work through a Linux firewall with IP masquerade. Linux VPN Masquerade HOWTO Note that this is not required if the same machine does IPsec and masquerading, only if you want a to locate your IPsec gateway on a masqueraded network. HowTo: MikroTik Secure VPN Part 1.5 MikroTik to MikroTik Jan 12, 2016 VPN-O-Rama: VPNs intro, practical HOWTOs - Linux.com Jan 04, 2011 Debian/Jessie: Easiest way to connect to VPN (Ipsec)