Hi,

We have a problem with duplicate sessions on our MikroTik wireless network with FreeRADIUS when OSPF kicks in:

Subscription Analysis for user@isp 2010-01-17 up to 2010-01-25 # logged in session time upload download server terminate cause callerid 1 2010-01-23 22:07:31 15 hours 6.9 MB 83.6 MB 192.168.199.254:513 - 00:0B:6B:DB:A9:96 2 2010-01-22 22:07:30 18 hours 16.2 MB 451.1 MB 192.168.208.1:434 - 00:0B:6B:DB:A9:96 3 2010-01-22 22:07:29 1 days 27.0 MB 0.6 GB 192.168.199.254:434<http://192.168.199.254:434> Session-Timeout 00:0B:6B:DB:A9:96 4 2010-01-21 22:07:27 1 days 4.7 MB 65.0 MB 192.168.199.254:386<http://192.168.199.254:386> Session-Timeout 00:0B:6B:DB:A9:96 5 2010-01-20 22:07:25 1 days 2.9 MB 45.7 MB 192.168.199.254:331<http://192.168.199.254:331> Session-Timeout 00:0B:6B:DB:A9:96 6 2010-01-19 22:07:23 2 hours 171.3 KB 1.4 MB 192.168.208.1:290<http://192.168.208.1:290> - 00:0B:6B:DB:A9:96 7 2010-01-19 22:07:23 1 days 2.9 MB 24.5 MB 192.168.199.254:290<http://192.168.199.254:290> Session-Timeout 00:0B:6B:DB:A9:96 8 2010-01-18 22:07:20 1 days, 1 seconds 3.8 MB 66.2 MB 192.168.199.254:207<http://192.168.199.254:207> Session-Timeout 00:0B:6B:DB:A9:96 9 2010-01-17 22:07:15 1 days 1.5 MB 10.0 MB 192.168.199.254:166<http://192.168.199.254:166> Session-Timeout 00:0B:6B:DB:A9:96 10 2010-01-17 22:07:15 0 seconds 0.0 KB 0.0 KB 192.168.208.1:166<http://192.168.208.1:166> - 00:0B:6B:DB:A9:96

High site 1 is 192.168.199.254 and high site 2 is 192.168.208.1. As you can see it looks like FreeRADIUS counts the extra data on the dropped connection as well.

The only suggestion I have received so far is to use a product called SMRadius (http://www.smradius.org/tiki-index.php?page=Features) that apparently merges duplicate sessions.

..unless this is a shameless plug for that product... really? someone advised you to use a product whose only release is unstable beta 0.1 version? Why not eh? why not go for such an untried and low-share product. looking at the feature list i cannot see why it would operate any differently or how it would easily solve your problems.

I have heard about some other people with large MikroTik networks and OSPF and FreeRADIUS that they are having the same problem. I have also described this problem on the MikroTik forum: http://forum.mikrotik.com/viewtopic.php?f=2&t=38620

so, basically, when OSPF kicks in, your routing topology is changing and therefore your client NAS devices apear to be coming from a different location and hence have a different ID - is it is the clients themselves end up operating via a different subnet instead? this isnt a RADIUS problem per-se - more a logical networking issue. you need to look at what things change and why when you have an OSPF issue (I'm not sure what you mean by OSPF 'kicking-in' - in a properly routed network, the routing protocol is ALWAYS active - its just when an event takes place that the routing protocol decides what path should be used.

please assist urgently, this problem is leading to some difficult client service inquiries.

apart from this initial advice, my next bit of advice would be to get a proper support contract for FreeRADIUS is its urgent and you are getting client service inquiries which cause you to query your architecture alan