NAC silent devices with EXOS and VOSS

[Lukas99]

Hi,

in our network, we have “silent devices” such as label printers and VoIP phones. These devices are physically connected to the network but do not initiate any active communication. They are intended to be authenticated via NAC.

However, after some time, they become unreachable, as the system considers them "offline"—even though the corresponding port remains active. In this state, the device can no longer be accessed.

As soon as we manually assign a static VLAN to the port, the device starts working properly again.

We are using both EXOS and VOSS. The reauthentication timer is set to 8 hours.

For EXOS, we tried to resolve the issue by setting idle-timeout 0 via NAC, but unfortunately, this did not solve the problem.

Has anyone encountered similar behavior or found a solution?

Thanks

[Chris_H · Accepted solution]

The problem here is most of the time the timeout of the FDB entry. 

If you haven't done so, you can check the following kb article with some options: https://extreme-networks.my.site.com/ExtrArticleDetail?an=000057116

[Gabriel_G]

^^ Chris has the right answers.

If the idle-timeout of 0 is not working, you may want to check with GTAC to make sure that is a valid solution or if there is some issue there.

In my opinion, the easy solution is to have something ping these devices on a regular basis to keep them 'awake'. You can add devices to XIQ-SE as 'ping only' to accomplish just this task and also monitor the availability of these devices at the same time!

[rmu · Accepted solution]

hi

you need to set the session-timeout to 0.

Try to send theses attributes in the radius accept:

Session-Timeout=0

Idle-Timeout=0

NR

rmu

[Lukas99]

That's the best solution for me. Only the command "configure netlogin idle-timeout" is failing.

[Chris_H · Accepted solution]

The problem here is most of the time the timeout of the FDB entry. 

If you haven't done so, you can check the following kb article with some options: https://extreme-networks.my.site.com/ExtrArticleDetail?an=000057116