DHCP code in 2.0.4+

Karl Auer kauer at biplane.com.au
Sun Jun 7 17:35:05 CEST 2009

On Sun, 2009-06-07 at 15:18 +0100, Alexander Clouter wrote:
> The state lives in the database.  ISC's DHCP has it's own 'database' 
> which is just a flat text file...FreeRADIUS just puts everything in SQL.

Where you store the state is irrelevant, though it's easier to manage
and more scalable if it's in a database. It's what you do with the state
that is important.

> This is all solved by *load-balancing*.  If your load-balancer cannot 
> detect that a DHCP/RADIUS server is dead then you need to get a better 
> load-balancer.

I think we are talking quite different kinds of load balancing. I'm
talking about balancing the leases between the two participants in a
failover relationship, you are talking about packet-level
load-balancing. My bad.

> The takeover and recovery is just something that helps people not need a 
> load-balancer and spit out packets to the broadcast address of the VLAN 
> both the DHCP servers sit in.

What? Either you are talking about real DHCP failover or you are not. If
both the DHCP servers in a failover relationship are in the same VLAN,
you have a problem right there. Takeover and recovery are the entire
point of having failover at all.

> We personally use Cisco's IOS (which is pretty naff, but just about 
> usable[1]), but you could use a Linux based HA system.

I think we are talking about different things here. But I'd still like
to see whatever docs there may be on how freeradius does failover.

Regards, K.

Karl Auer (kauer at biplane.com.au)                   +61-2-64957160 (h)
http://www.biplane.com.au/~kauer/                  +61-428-957160 (mob)

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