How to enable VPN support in ASUS Dual-Band Wireless Router RT-N56U

Just upgraded to a dual-band (2.4GHz and 5.0GHz) wireless router ASUS RT-N56U, everything is working fine but it does not support VPN access by default. With the default setup, when I launched the CISCO VPN Client (5.0.07.0440) I got “Reason 421, peer no response…” error message after a few minutes’ unsuccessful connection tries.

To allow the VPN access to be used so that I can connect to the company network at home through this new router, I had to enable the IPSec passthrough.

Here is how-to:

  1. First, make sure the RT-N56U has the latest firmware. I have the 1.0.1.7f version when this post is wrote
  2. Go to the ASUS RT-N56U admin interface (http://192.168.1.1 or any IP address you use) with the correct log in credentials (admin/admin);
  3. Click WAN then select NAT Passthrough tab, select Enabled option for IPSec Passthrough as the figure below. Click Apply to save the change.
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4 thoughts on “How to enable VPN support in ASUS Dual-Band Wireless Router RT-N56U

  1. JAMES SMITH

    Can you or anyone recommend any other printers I can compare this one to? I’m looking at this one or the brother hl-2270dw. Anyone have any hints?

    [Reply]

  2. Sandeep

    Oh my I have been looking for hours for a solution to get my VPN/ Fortinet Client/ to work with this new router.
    Finally the instructions above worked for me

    “3.Click WAN then select NAT Passthrough tab, select Enabled option for IPSec Passthrough as the figure below. Click Apply to save the change.”

    [Reply]

  3. Simonbsinister

    I just purchased an Asus RT-N56U to replace a linksys router that dies. Everything worked great…except when I tried to use VPN. I got the “remote host not found” message after timeout. I could ping the VPN destination however. After I double and triple checked my setup, scratched my head, did a search, Webguru had the answer. IPsec now enabled! Thanks. Did not have to bother with this on any of my previous routers, probably because it was enabled by default. Thanks again Sandeep.

    [Reply]

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