<div dir="ltr"><div><div>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.<br><br></div>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?<br><br></div>Edwin<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, May 12, 2017 at 3:01 PM, Chris Brown <span dir="ltr"><<a href="mailto:cbbrown@gmail.com" target="_blank">cbbrown@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><br></div>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. <span class="HOEnZb"><font color="#888888"><div><br></div><div>Chris. </div><div><br><div><br></div></div></font></span></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On 12 May 2017 at 12:41, Karl Hardisty <span dir="ltr"><<a href="mailto:karl@mothership.co.nz" target="_blank">karl@mothership.co.nz</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">5 minutes?<div><br></div><div>Sounds like someone got confused between pre-move TTLs and DHCP lease times.</div><div><div><br class="m_6143221475041759768m_5435317961518548711Apple-interchange-newline">
</div>
<br><div><blockquote type="cite"><span><div>On 12/05/2017, at 4:30 PM, Craig O'Toole <<a href="mailto:cotoole@remex.com.au" target="_blank">cotoole@remex.com.au</a>> wrote:</div><br class="m_6143221475041759768m_5435317961518548711Apple-interchange-newline"></span><div><span><font size="2" face="sans-serif">Anyone from Optus looking after NBN HFC
on the list?</font>
<br>
<br><font size="2" face="sans-serif">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.... </font>
<br>
<br><font size="2" face="sans-serif">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. </font>
<br>
<br><font size="2" face="sans-serif">Can't be good for anyone, let alone
the DHCP servers load....</font>
<br>
<br><font size="2" face="sans-serif">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.</font>
<br>
<br><font size="2" face="sans-serif">Cheers</font>
<br><font size="2" face="sans-serif"><br>
Craig</font>
<br>
<br>
<br></span><span id="m_6143221475041759768m_5435317961518548711cid:_1_0DDA75F80DDA48440018C411CA25811E"><Mail Attachment.gif></span><span><font size="2" face="sans-serif"><br>
Information contained in this email is intended for the addressees only.</font><br>--
<br>This message has been scanned for viruses and
<br>dangerous content by
<a href="http://www.exl.com.au/" target="_blank"><b>EXL - Internet with a difference</b></a>, and is
<br></span>believed to be clean.
______________________________<wbr>_________________<br>AusNOG mailing list<br><a href="mailto:AusNOG@lists.ausnog.net" target="_blank">AusNOG@lists.ausnog.net</a><br><a href="http://lists.ausnog.net/mailman/listinfo/ausnog" target="_blank">http://lists.ausnog.net/mailma<wbr>n/listinfo/ausnog</a><br></div></blockquote></div><br></div></div><br>______________________________<wbr>_________________<br>
AusNOG mailing list<br>
<a href="mailto:AusNOG@lists.ausnog.net" target="_blank">AusNOG@lists.ausnog.net</a><br>
<a href="http://lists.ausnog.net/mailman/listinfo/ausnog" rel="noreferrer" target="_blank">http://lists.ausnog.net/mailma<wbr>n/listinfo/ausnog</a><br>
<br></blockquote></div><br></div>
</div></div><br>______________________________<wbr>_________________<br>
AusNOG mailing list<br>
<a href="mailto:AusNOG@lists.ausnog.net">AusNOG@lists.ausnog.net</a><br>
<a href="http://lists.ausnog.net/mailman/listinfo/ausnog" rel="noreferrer" target="_blank">http://lists.ausnog.net/<wbr>mailman/listinfo/ausnog</a><br>
<br></blockquote></div><br></div>