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<!-- ##### NINE BODY BEGIN ##### -->(Sorry for top posting, this client is a bit stupid)<br>
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Technically, the server is correct in that after a "release" is received, it is free to assign the address to another client, and as such, the client should not expect to receive the same address on the next assignment.
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However, following the principle of least surprise, I agree that the user probably expects to receive the same address, especially if they are just changing some settings on the wan interface.
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If you are free to change both server and client behavior, I believe a combination of 2 and 4 is probably the "most correct" solution.
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The client should probably send a release both for v4 and v6 at the same time. <br>
But on the other hand, it would be nice if the server would remember the previous lease, at least for a while, and reassign it to the client if another request comes in within a reasonable time.
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The last part should be configurable on the server side, as there are scenarios where you want your clients to not have this kind of semi static assignment.
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Also, the server should obviously be allowed to assign a cached lease to a different client if the pool is otherwise empty.
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Rgds <br>
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Ola (T) <br>
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<div style="border:none; padding:3.0pt 0cm 0cm 0cm"><span style="font-size:11.0pt;font-family:Calibri, Arial, Helvetica, sans-serif"><b>Fra:</b> Ross Chandler <ross@eircom.net><br>
<b>Sendt:</b> 7. aug. 2017 00:34<br>
<b>Til:</b> IPv6 operators forum<br>
<b>Emne:</b> DHCP versus DHCPv6 Release behaviour<br>
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<p dir="ltr">(...) <br>
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The choices seem to be<br>
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1. Do nothing and accept dynamic IPv6 delegated prefixes changing more often than the IPv4 address<br>
2. Make the DHCP client send Releases when DHCPv6 sends them<br>
3. Make the DHCPv6 client not send Releases under the same conditions DHCP doesn’t send them<br>
4. Remember the DHCPv6 lease for some duration after a Release comes in so that it may be given out again<br>
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