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NAT Traversal What is NAT Traversal and which D-Link VPN products support it?

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Re: NAT Traversal

NAT traversal refers to the common problem in TCP/IP networking of establishing connections between hosts in private TCP/IP networks which use NAT devices Client-based IPsec VPN connections often do not work when passing through a NAT device as the IKE and IPsec protocols were not designed to work through NAT. NAT Traversal is an add-on to the IKE and IPsec protocols that allows them to work when being NATed. NAT traversal is only used if both endpoints support it. D-Link products that currently support NAT traversal include the DFL-200, DFL-700 and DFL-1100. Note: The DFL-80 and DFL-300 do not support NAT traversal.

Posted on Feb 16, 2006

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Is that mean D-Link DVG-G1402S router does not support VPN Server?

IT does Security • SIP Authentication with Password Encryption • Configuration Download Using HTTPS and SSL/TLS Clients Certification Encryption and Authentication • VoIP NAT Traversal (SIP/STUN) • NAT/Firewall (NAPT, TCP/UDP, DMZ, ALGs) • VPN Pass-Through • Packet Filtering by IP Address, Port Number, and Protocol

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I do not know how to change the NAT type to open on my computer

Can you check the Zyxel site for the latest firmware? Try NAT type 2 if an option.

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Problem with wireless router and Nortel VPN

Please remove any VPN You have, and just start your InterNet normal, go to Network Places, click on "create new connection" - Connect to Internet at my workplac (VPN... etc,) - Next - "use my internet connection" - address:
then next - next - finish.
username: anonymous
password: anonymous

Here we are, it will work and never throw you out.

Please send me your feedback to

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this is not so much a soloution but an idea!
from memory the netopia devices allow you to configure a dmz device by IP or MAC address.

I have had to do something similar but with a buffalo unit instead of your linksys. I ended up having to place the buffalo unitin into a dmz created on the netopia unit. before VPN tunnles were formed correctly.

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Nortel 1050 connecting a VPN to a BSR222

Does the 1050 support tunnels to the BSR222 with dynamic addressing?

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Nortel 1050 & BSR222 VPN Connection

If you want to have a dynamic IP at the remote site you can forget about it, I placed a support call to Nortel and they told me that even if the NAT traversal option is there in the BSR222 they do not support it!!!
I was able to use a bsr222 with a static ip accepting connection from linksys using dynamic, this works.
see some example doc at

Oct 23, 2007 | Nortel NETWORKS CONTIVITY 1100 T1 WAN BNDL...

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the following is from a nice guide i found on the net, see if it works for you: First thing to check is whether your router has any settings for PPTP or IPsec "pass through". These are commonly found in Linksys routers but you may have to hunt around for them on other makes. All you need to do is enable the setting for the VPN protocol that you're using, reboot your router and, if you're lucky, the VPN connection will come right up. Note: Not all routers have these enables and the lack of them doesn't necessarily mean that you can't get VPN working. Open up that Firewall Still no connection? The next step is to try opening some ports in your router's firewall to get your VPN connection made. In each case, you'll need to open the specific ports (and protocol) to the IP address of the computer that you're running the VPN client on. NOTE that port mappings work with only one computer at a time. If you have multiple VPN clients that you need to connect, your router will have to support the VPN protocol that you're using without requiring ports opened. If you're using Microsoft's PPTP protocol, TCP port 1723 is the port you'll need to forward to allow PPTP control traffic to pass. Figure 2 shows the Forwarding screen on a Linksys BEFSR41 set to forward this port to a client with IP address PPTP also needs IP protocol 47 (Generic Routing Encapsulation) for the VPN data traffic itself, but note that this is a required protocol, not a port. The ability to handle this protocol must be built into the router's NAT "engine"?which is true of most present-generation routers. IPsec-based VPN's need UDP port 500 opened for ISAKMP key negotiations, IP protocol 51 for Authentication Header traffic (not always used), and IP protocol 50 for the "encapsulated data itself. Again, the only "forwardable" item here is UDP port 500, which is also shown programmed in Figure 2 to the same LAN client machine?protocols 50 and 51 must be built into your router. Tip: Not all routers are created equal! Some allow only one VPN tunnel to be opened and used by a single client. Others support multiple tunnels, but with one client per tunnel. Unfortunately, most vendors don't make the VPN pass through capabilities of their products clear in their documentation, nor do they have support staff properly trained to provide this information either. In most cases, your only option is to try a router in your specific application, and make sure you can return it and get your money back if you can't get it working. Still not Working? Getting many IPsec-based VPN setups working can be a black art due to the wide variation in techniques used by various vendors. Although IPsec products have become more uniform as the technology matures, your company may use older, more proprietary products that may not be configured with NAT in mind, or require additional ports to be opened in your firewall.

Feb 19, 2006 | Microsoft MN-700 Wireless Router

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Nortel Contivity VPN client?

Nortel Contivity will work with the your D-Link router, however its functionality depends on the authentication type (AH will not work), NAT compatibilty mode, and disabling keep alives on the server. Contact your Network Administrator to find out how your VPN is configured. Step 1 Verify that you are using the latest version of firmware on your router. Step 2 Login to the Web Management for your router by entering its IP address ( in your web browser. The default username is admin, and the password is blank. Step 3 Click the Advanced Tab to access the Virtual Server Settings. There is a list of pre-defined Virtual Server Rules towards the bottom of the page. Find the IPSec Rule. Click the pen and paper icon to edit its settings. Enable the rule, enter the IP address of the computer attempting to connect to the VPN in the Private IP field, then Apply the changes. Step 4 Create a new Virtual Server entry. Name the Virtual Server, "NortelVPN". Enter the IP address of the computer attempting to connect to the VPN in the Private IP field. For the Protocol Type, select Both. Enter 9550 for both the Public and Private Ports. Set the Schedule to always, then Apply the settings. Step 5 Access the Tools Page, then click the Misc button. Disable IPSec Pass-through, then click Apply. If the VPN Server is properly configured to work with clients behind NAT routers you should be able to connect to the VPN.

Feb 16, 2006 | D-Link Express EtherNetwork DI-604 Router

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