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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Paul Ward:
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Thank you to all who have participated in this thread. I've just proposed a fix in gerrit. For those involved thus far, if you could review I would be greatly appreciative!</span><br>
<br>
<span style="font-size:10.0pt;font-family:"Arial","sans-serif""><a href="https://review.openstack.org/#/c/68742/1">https://review.openstack.org/#/c/68742/1</a><br>
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</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I wouldn’t go so far as to say this verification SHOULDN’T be added, but neither would I say it should. >From a general use case perspective I don’t think IPv4 subnets smaller
than /29 make sense. A /32 is a commonly used subnet length for some use cases (e.g. router loopback interface) but may not have an applicable use in a cloud network. I have never seen a /31 network used anywhere. Point to point links (e.g. T1/Frame Relay/etc)
are often /30 but I’ve never seen a /30 subnet for anything other than connecting two routers.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">However, does it really benefit the user to specifically block them from entering /32 or block them from entering /30, /31, and /32?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">It might not be an equal amount of code, I think a much better effort to help the user would be to provide them with a subnet calculator directly in Horizon
to show them how many usable IPs are in the subnet they’re defining. In this case, displaying “Usable addresses: 0” right when they enter /32 would be helpful and they would figure out for themselves whether they really wanted that mask or if they meant something
else?<o:p></o:p></span></p>
<p><o:p> </o:p></p>
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