On 18 Feb 2011, at 14:26, Phil Mayers wrote: > On 18/02/11 14:16, Dean, Barry wrote: >> I have been asked to do just this and I am working on the solution >> now. >> >> We wanted to use multiple pools of VLANs/Subnets and assign "Staff" >> to one pool and "Students"# to the other. Then to select a VLAN >> within the pool, use a hashing function and select a VLAN. >> >> One concern I have is when is post-auth called? Would it get called >> for interim authentication requests? Because I don't want to be >> changing the VLAN mid sessions, which could potentially happen with a >> non-deterministic hash! > > There is no such thing as an "interim" authentication request. > > Post-auth is called after every auth. > > I suspect you are referring to feature(s) on the switch(es) you use > where it will "re-auth" the client after X minutes. That's just another, > separate authentication as far as FreeRadius is concerned
Yep, I was referring to the entries I see in my logs for "Interim-Update", which is of course an Accounting record, and I had always assumed this went with an Auth as well, but have never looked in detail to see! So I am most likely talking rubbish! >> >> In my tests I have been creating a hash from the 'State' attribute > > That's a very bad idea. It will change mid-session and cause you huge > problems. > I will not be using this then :-) > We do pervasive VLAN assignment on a large scale here, and my advice is > the same as others in the thread - don't use a hash value. Just map a > user or group to a vlan. > > If you need to "balance the numbers of users on a vlan" (why?) then you > should log the vlan assignments to SQL and run a post-processing script > that changes the assignment to keep the "load balanced". > > Personally we just run big subnets to reduce the waste of IP space and > configuration overhead. > I don't design the wireless network here, I just make the RADIUS work as best I can. It has been decided to have smaller private IP ranges each associated with a VLAN and balance the routing of these across two routers. Then I was asked if I can distribute the users across these VLANS evenly. I am beginning to think a round robin allocation might just do! However, the goal posts could move again yet! Latest news is that we will have 1 pool of VLANs, so time to tear up the existing code and take a fresh look! I currently have no idea how big these subnets will be either. ---------------------- Barry Dean Principal Programmer/Analyst Networks Group Computing Services Department Tel: 0151 795 9540 Skype: barryvdean
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--- Nice boy, but about as sharp as a sack of wet mice. -- Foghorn Leghorn
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