Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

Cisco 871, EasyVPN and RADIUS

Hi there,

I have a problem with the following scenario: a Cisco 871 with dynamic IP address has to establish an VPN Tunnel to a Cisco 3000 Concentrator (Easy VPN). The users connected to the LAN ports of the 871 have to authenticate using 802.1x in order to access the VPN tunnel. The RADIUS server is located behind the 3000.

VPN tunnel is successfully established and loopback0 is created dynamically on the 871 with an IP from Concentrator's IP pool. But I need to specify "ip radius source-interface" for RADIUS communication. Sadly, I can't use loopback0 because it gets dynamically destroyed/created. I can't use FastEthernet4 because its IP is dynamic and I can't use Vlan1 because its down as long as no one is authenticated.

Any idea how to solve that? What if I create another static Loopback? How will routing work then? Thanks!


Re: Cisco 871, EasyVPN and RADIUS

Try this link for configuring the link between router and vpn concentrator