Vinay Wagh wrote:
A couple of questions on Acct-Interim-Interval
These are really questions for the IETF RADIUS standards group. That being said, they are partially covered in my document: http://www.ietf.org/internet-drafts/draft-ietf-radext-fixes-08.txt It will be issued as an RFC in a few weeks to months. Anyone implementing RADIUS systems *should* read it. They should also read my other document: http://www.ietf.org/internet-drafts/draft-ietf-radext-design-00.txt Which discusses protocol design issues.
1. I wanted to know if the Acct-Interim update that comes from the NAS has any relevance as far as the user session maintained in the radius server is concerned. Meaning that is it treated like a keep-alive of some sort. If the Acct-Interim-Interval is configured to be 100 seconds and the NAS sends the Interim-Update after 200 seconds does the freeradius server care ?
Many RADIUS servers *will* care. In some cases, it *is* treated as a signal that the user session is still alive.
2. What is the typical value of this attribute, I ask because if this value is configured to be small then it will generate a lot of interim updates from a NAS that supports large number of subscribers. At the same time I am not sure how the service providers who deploy the server use this Attribute and how often do they want the updates.
See RFC 2869 for recommended values. Alan DeKok.