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<p class="MsoNormal"><span style="color:#002060">Hi All,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#002060"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#002060">A while back I touched on an issue where by Cisco CPE on NBN tail is configured for IP helper against a centralised DHCP server, the DHCP request hits the DHCP server, the DHCP server responds with an offer which
can be observed in a capture egressing to the NBN NNI however the offer does not pop out at the UNI-D. The issue presents on some NBN tails and no others, Eg a customer with 6 sites has 4 working and 2 not, even though the config is pretty much identical except
for addressing. This issue has been isolated by NBN and I thought I would share our findings.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#002060"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#002060">The DHCP standard RFC 2131 states that “DHCP messages from a client to a server are sent to the 'DHCP server' port (67), and DHCP messages from a server to a client are sent to the 'DHCP client' port (68)". It
would appear that in Cisco IOS both the DHCP discovery and offer packets having a source and destination port of UDP 67.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#002060"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#002060">The AVCs under fault are connected via the newer model NTD which nbn began deploying as standard issue across the network from around July 2015. This hardware correctly handles DHCP packets with regards to RFC
2131, whereas the older model hardware had a “minor defect” which resulted in the DHCP packets being passed even when addressed to the incorrect port. In essence, “the services working in this configuration on the older model hardware were only doing so by
accident, not by design, and thus the situation is not something that nbn is able to correct”<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#002060"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#002060">The NTD hardware can be identified by the model ID silkscreened on the front panel; the older hardware is the I-240G-R, the newer variant is the G-240G-P. We are working with Cisco on a resolution, if you are
also affected by this issue and would like to be notified of the progress please just let me know.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#002060"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#002060">Kind regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#002060"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:16.0pt;color:#0B53B6;mso-fareast-language:EN-AU">Matt Carter</span></b><span lang="EN-US" style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:6.0pt"><b><span lang="EN-US" style="color:#3989F3;mso-fareast-language:EN-AU">Senior Network Engineer<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:9.0pt;color:#002A8F;mso-fareast-language:EN-AU">Phone:</span></b><span lang="EN-US" style="font-size:9.0pt;color:#5C5C5C;mso-fareast-language:EN-AU"> 1300 661 668 |
</span><b><span lang="EN-US" style="font-size:9.0pt;color:#002A8F;mso-fareast-language:EN-AU">Fax:</span></b><span lang="EN-US" style="font-size:9.0pt;color:#5C5C5C;mso-fareast-language:EN-AU"> 1300 661 540</span><span lang="EN-US" style="color:black;mso-fareast-language:EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:9.0pt;color:#002A8F;mso-fareast-language:EN-AU">Email:</span></b><b><span lang="EN-US" style="font-size:9.0pt;color:#3989F3;mso-fareast-language:EN-AU">
</span></b><u><span style="color:#3989F3;mso-fareast-language:EN-AU"><a href="mailto:matt.carter@iseek.com.au"><span lang="EN-US" style="font-size:9.0pt;color:#3989F3">matt.carter@iseek.com.au</span></a></span></u><span style="font-size:9.0pt;color:#3989F3;mso-fareast-language:EN-AU">
</span><span style="font-size:9.0pt;color:black;mso-fareast-language:EN-AU">| </span>
<b><span style="font-size:9.0pt;color:#002A8F;mso-fareast-language:EN-AU">Web:</span></b><b><span style="font-size:9.0pt;color:#1F497D;mso-fareast-language:EN-AU">
</span></b><span style="font-size:9.0pt;color:#3989F3;mso-fareast-language:EN-AU"><a href="http://www.iseek.com.au/"><span lang="EN-US" style="color:#3989F3">http://www.iseek.com.au</span></a></span><span lang="EN-US" style="color:black;mso-fareast-language:EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:9.0pt;color:#00007F;mso-fareast-language:EN-AU">Address:
</span></b><span lang="EN-US" style="font-size:9.0pt;color:#5C5C5C;mso-fareast-language:EN-AU">Level 4, 60 Edward Street, Brisbane QLD 4000</span><span style="font-size:9.0pt;color:black;mso-fareast-language:EN-AU"> |
</span><span lang="EN-US" style="font-size:9.0pt;color:#5C5C5C;mso-fareast-language:EN-AU">PO Box 15087, City East QLD 4002</span><span style="color:black;mso-fareast-language:EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;color:#5C5C5C;mso-fareast-language:EN-AU"> </span><span style="color:black;mso-fareast-language:EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.5pt;color:#002A8F;mso-fareast-language:EN-AU">NB: iseek HQ has moved to Brisbane CBD.</span></b><span lang="EN-US" style="font-size:11.5pt;color:#5C5C5C;mso-fareast-language:EN-AU"> </span><span lang="EN-US" style="font-size:10.0pt;color:#5C5C5C;mso-fareast-language:EN-AU">Effective
2 February 2015</span><span style="font-size:10.5pt;color:black;mso-fareast-language:EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black;mso-fareast-language:EN-AU"> </span><span lang="EN-US" style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="color:black;mso-fareast-language:EN-AU"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;color:#1F497D;mso-fareast-language:EN-AU">This e-mail and any files transmitted with it may contain confidential and privileged material for the sole use of the intended recipient. Any review, use, distribution
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