enable NAT-Traversal (NAT-T) on your hardware, and allow UDP port 4500 to go through your firewall.
If you're using a PIX firewall as both your firewall and VPN endpoint, make sure to open port 4500, and enable nat-traversal in your configuration with the command isakmp nat-traversal 20, where 20 is the NAT keepalive time period. If you have a separate firewall and a Cisco VPN Concentrator, make sure to open up UDP port 4500 on your firewall with a destination of the concentrator. Then, on the concentrator, go to Configuration | Tunneling and Security | IPSec | NAT Transparency and check the 'IPSec over NAT-T' option. On Fri, Jan 15, 2010 at 4:12 AM, raghav gurung <[email protected]> wrote: > Hi All, > > I am having a issue while configuring l2tp vpn in win vista. I am not able > to connect to vpn if my system ip is NATed. While it works on public IP. > > Can any body guide me how to configure it in win vista. > > -- > Regd > Raghav Gurung > +91 9582307405 > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
