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

[Philip Loenneker]

It could also be that they have a short lease time to avoid users calling up to complain that their internet doesn’t work if/when they change CPE, depending on how the DHCP server handles giving out an IP that is already assigned to a MAC address.


From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Chris Brown
Sent: Friday, 12 May 2017 3:02 PM
To: Karl Hardisty <karl at mothership.co.nz>
Cc: ausnog at lists.ausnog.net; Craig O'Toole <cotoole at remex.com.au>
Subject: Re: [AusNOG] Optus NBN HFC lease time 5 minutes....


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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