[AusNOG] DHCP server suitable for NBN

[Philip Loenneker]

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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