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

[Edwin Groothuis]

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> 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> 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> 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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