[AusNOG] Optus NBN HFC lease time 5 minutes....

[Philip Loenneker]

Hi Edwin,

Some NBN access technologies let you do a port reset facing the CPE, but not all. FttN/B and FttP do, but not wireless. I’m not sure about satellite.

From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Edwin Groothuis
Sent: Friday, 12 May 2017 5:38 PM
To: Chris Brown <cbbrown at gmail.com>
Cc: ausnog at lists.ausnog.net; Craig O'Toole <cotoole at remex.com.au>
Subject: Re: [AusNOG] Optus NBN HFC lease time 5 minutes....

RFC2131 (3.7 When client should use DHCP) states that a DHCP request should be done after a network disconnection, which actually makes sense and would reject the need for short lease times.
Do the RSPs on the NBN have the ability the perform a link drop event towards the CPE forcing it to renew its DHCP lease?
Edwin

On Fri, May 12, 2017 at 3:01 PM, Chris Brown <cbbrown at gmail.com<mailto:cbbrown at gmail.com>> wrote:

It's been a while since I looked at this stuff but they may be doing it for exactly the same reason as server guys drop TTL's - They're looking at moving some or all of those users to a new IP range (maybe on a new or different CMTS) so they've dropped the lease time in the week leading up to it so they don't end up with hundreds (or thousands) of isolated clients with incorrect IP's.

Chris.



On 12 May 2017 at 12:41, Karl Hardisty <karl at mothership.co.nz<mailto:karl at mothership.co.nz>> wrote:
5 minutes?

Sounds like someone got confused between pre-move TTLs and DHCP lease times.


On 12/05/2017, at 4:30 PM, Craig O'Toole <cotoole at remex.com.au<mailto:cotoole at remex.com.au>> wrote:

Anyone from Optus looking after NBN HFC on the list?

Just been investigating an issue where one of my clients have an Optus NBN HFC service. Optus is delivering dynamic IPs with a lease time of 5 mins....

Half life of 2.5 mins getting occasionally dropped, too short a half life for any re-tries. Several re-numbers a day... Killing Voice calls, (and Netflix) and making IPSEC VPN almost unusable with DDNS.

Can't be good for anyone, let alone the DHCP servers load....

I am happy to confirm and assist diagnosis, and if anyone has a contact at Optus in the team looking after this part of the design please send me a contact so I may assist.

Cheers

Craig


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