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On today’s IPv6 Buzz podcast, Scott and Tom talk about DHCPv6 Option 108. Option 108 basically allows a DHCP server to use IPv4 to contact a host and tell that host to disable its IPv4 stack and switch to IPv6-only. In other words, you’re using IPv4 to turn off IPv4. This peculiar capability is proposed in RFC 8925: IPv6-Only Preferred Option for DHCPv4.
We discuss:
- DHCPv6 Option 108 and what it does
- Operational use cases for this option
- Current OS support
- Using Option 108 to turn off IPv4 for short intervals instead of permanently
- How Option 108 fit into the larger picture of DHCPv6 in particular and IPv6 auto-addressing in general
Thanks for listening!
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Show Links:
IPv6-Only-Preferred Option for DHCPv4 (RFC 8925) – IETF
IPv6 Router Advertisement IPv6-Only Flag – IETF
Your Hosts:
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08:31 Very odd – I’m running Windows 10 23H2 and, while I haven’t actually tested whether it works, packet traces show the Windows DHCP client is actually requesting Option 108 in its DHCPDISCOVER and DHCPREQUEST packets.