[AusNOG] DHCP server suitable for NBN

[Craig Askings]

I've not tried it in that particular configuration, but Freeradius can act directly as a DHCP server.


> On 24 Aug 2016, at 9:53 AM, Philip Loenneker <Philip.Loenneker at tasmanet.com.au> wrote:
> 
> Hi all,
>  
> We have used a couple of different DHCP servers for NBN IPoE sessions over the last few years, all talking to a RADIUS back end to look up the static IP address information based on circuit-ID (AVC). Initially we used a Mikrotik router, but with a change in RADIUS server we need the DHCP server to use the circuit-ID as the AAA username, and the Mikrotik only uses the MAC address. I found that the DHCP server in our Cisco ASR could send the circuit-ID as the AAA username, but it has a “feature” where AAA-based DHCP sessions have a maximum life (defined by Cisco AVPair session-duration, which has to exist and can’t be zero) after which the DHCP lease is forced to be released and has to be renewed from scratch. This causes a brief outage to the service while they have no IP address, and causes some of our clients to failover to an alternate connection. After a chat with Cisco, I was told that it was by design and would not be changed or allowed to be overridden.
>  
> Our RADIUS server is FreeRADIUS, but it’s integrated with a customer management system, and it doesn’t allow us to use DEFAULT as the username and pick up the circuit-ID as an additional check.
>  
> Does anyone have any suggestions of a DHCP server that leverages RADIUS and can use circuit-ID as the AAA username, but is otherwise standard and allows unlimited renewals?
>  
> Regards,
> Philip Loenneker | Network Engineer | TasmaNet
> 40-50 Innovation Drive, Dowsing Point, Tas 7010, Australia
> P: 03 6165 2542 | M: 0404 097 816
> philip.loenneker at tasmanet.com.au <mailto:philip.loenneker at tasmanet.com.au>
> www.tasmanet.com.au <http://www.tasmanet.com.au/>
>  
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