[ScreenOS] What ports are used for a Virtual Private

Configuring Layer 2 Tunneling Protocol (L2TP) over IPSec Jan 19, 2006 Which ports do you need to open on a firewall to allow L2TP over IPSec To allow Internet Key Exchange (IKE), open UDP 500. To allow IPSec Network Address Translation (NAT-T) open UDP 5500. To allow L2TP traffic, open UDP 1701.

History. Published in 2000 as proposed standard RFC 2661, L2TP has its origins primarily in two older tunneling protocols for point-to-point communication: Cisco's Layer 2 Forwarding Protocol (L2F) and Microsoft's Point-to-Point Tunneling Protocol (PPTP).

Hi all, hope you can help me. I've been hitting with my head trying to put a VPN L2TP with IPsec Policy to work but I haven't been able to. Basically I have a Draytek router (LAN IP connected to a Cisco Router via the Wan 1 port (WAN IP and the Cisco router having the I Secure Sockets Layer (SSL) uses TCP port 443 and works by using a private key to encrypt data that is transferred over the SSL connection. SSL also uses 465 Secure SMTP, 993 Secure IMAP, and 995 Secure POP. Layer Two Tunneling Protocol (L2TP) uses UDP port 1701 and is an extension of the Point-to-Point Tunneling Protocol. L2TP is often used

2. Go to NAT >> Open Ports, and open the required port to the IP address of the VPN server. The ports required for each protocol are: PPTP: TCP 1723 (the router will also forward GRE IP47 automatically) L2TP: UDP 1701 ; IPsec: UDP 500 and UDP 4500 if NAT-T is used (the router will also forward ESP IP50 automatically) 3.

Choose VPN as the interface and select L2TP over IPSEC. Add the server’s public IP address, a username on the VPN server, and click on Authentication Settings. For Password, add the user’s server account password and then add the pre-shared key value for Shared Secret.