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:
- First, make sure the RT-N56U has the latest firmware. I have the 18.104.22.168f version when this post is wrote
- 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);
- Click WAN then select NAT Passthrough tab, select Enabled option for IPSec Passthrough as the figure below. Click Apply to save the change.