Re: [dhcwg] RFC 8925 on IPv6-Only Preferred Option for DHCPv4
Roy Marples <roy@marples.name> Sun, 25 October 2020 20:06 UTC
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From: Roy Marples <roy@marples.name>
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Date: Sun, 25 Oct 2020 20:06:10 +0000
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Subject: Re: [dhcwg] RFC 8925 on IPv6-Only Preferred Option for DHCPv4
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On 17/10/2020 13:53, rfc-editor@rfc-editor.org wrote: > A new Request for Comments is now available in online RFC libraries. > > > RFC 8925 > > Title: IPv6-Only Preferred Option for DHCPv4 Just reading through this and I find this in section 3.2 ------------------------------------------------------------------------------- The IPv6-Only Preferred option SHOULD be included in the Parameter Request List in DHCPREQUEST messages (after receiving a DHCPOFFER without this option, for an INIT-REBOOT, or when renewing or rebinding a leased address). If the DHCPv4 server responds with a DHCPACK that includes the IPv6-Only Preferred option, the client's behavior depends on the client's state. If the client is in the INIT-REBOOT state, it SHOULD stop the DHCPv4 configuration process or disable the IPv4 stack completely for V6ONLY_WAIT seconds or until the network attachment event, whichever happens first. It also MAY send a DHCPRELEASE message. If the client is in any other state, it SHOULD continue to use the assigned IPv4 address until further DHCPv4 reconfiguration events. ------------------------------------------------------------------------------- It's the last line of the paragraph which is of interest. It implies that this option only works in the INIT-REBOOT state. The lack of the SELECTING state is pretty glaring but a minor omission. Am I correct in thinking that RENEWING and REBINDING states pretty much ignore this option if it was absent and is now present? Or is the intent to stop using the address when in these states as they are "DHCPv6 reconfiguaration events"? Or just wait until it naturally expires? It's not clear what the expected action here should be. Roy
- [dhcwg] RFC 8925 on IPv6-Only Preferred Option fo… rfc-editor
- Re: [dhcwg] RFC 8925 on IPv6-Only Preferred Optio… Lorenzo Colitti
- Re: [dhcwg] RFC 8925 on IPv6-Only Preferred Optio… Roy Marples
- Re: [dhcwg] RFC 8925 on IPv6-Only Preferred Optio… Michael Richardson