Radius Authentication to Server Remote from VPN Endpoint

Posted on 2010-11-15
Last Modified: 2013-11-21

I have users who dial-in to an ASA and authenticate via RADIUS to a server at Site A. There is a heavily used site-to-site VPN between site A and Site B. At site B there is another RADIUS server used to authenticate users who dial-in to Site B.

The RADIUS server at site A has gone down so I've added the Site B radius server to the AAA server groups but I'm unable to successfully authenticate across the site-to-site VPN. I've tried adding explicit firewall rules as packet tracer indicates that the failure is due to the implicit ACL but still won't connect.

Any idea how to achieve this?

Question by:TSG_Users
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
LVL 29

Expert Comment

by:Alan Huseyin Kayahan
ID: 34193546
What RADIUS is it? Windows IAS?
Can you ping the RADIUS server at site B from ASA command line? Most probably, the interesting traffic does not include the firewall itself.

Author Comment

ID: 34195202

Yes it is IAS and the ACL defines the inside-network/24 to remote-network/24 which includes both the ASA's inside interface address and the remote network entire subnet.

I can't ping the remote server from the ASA, so probably one and the same issue.
LVL 29

Accepted Solution

Alan Huseyin Kayahan earned 500 total points
ID: 34196809
The workaround is typically to issue the command management-access inside at global config, then most probably ping will work (assuming that icmp inspection is in place). If RADIUS still doesnt work although ping works, upgrae your ios to at least 8.0(4), define the RADIUS in asa as following

aaa-server Namehere (inside) host x.x.x.x (IAS server private IP)

Please double-check your port settings etc (1812,1813)
If still doesnt work, then set reverse route injection for the VPN tunnel at both ends, disconnect/reconnect the tunnel and then try again.

If still no joy, I will suggest a different workaround

Author Comment

ID: 34230218
Upgrade of the IOS seemed to fix it, thanks.

Will RRI work on networks where you are not using a routing protocol?
LVL 29

Expert Comment

by:Alan Huseyin Kayahan
ID: 34231996
Reverse route injection is primarily designed for VPN tunnels, so no routing protocol will be required. Routes get installed once the tunnel is up

Featured Post

Manage your data center from practically anywhere

The KN8164V features HD resolution of 1920 x 1200, FIPS 140-2 with level 1 security standards and virtual media transmissions at twice the speed. Built for reliability, the KN series provides local console and remote over IP access, ensuring 24/7 availability to all servers.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

ADCs have gained traction within the last decade, largely due to increased demand for legacy load balancing appliances to handle more advanced application delivery requirements and improve application performance.
For many of us, the  holiday season kindles the natural urge to give back to our friends, family members and communities. While it's easy for friends to notice the impact of such deeds, understanding the contributions of businesses and enterprises i…
Viewers will learn how to connect to a wireless network using the network security key. They will also learn how to access the IP address and DNS server for connections that must be done manually. After setting up a router, find the network security…
Both in life and business – not all partnerships are created equal. As the demand for cloud services increases, so do the number of self-proclaimed cloud partners. Asking the right questions up front in the partnership, will enable both parties …

730 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question