ICMP6 RA: recognise PIO PD Preferred flag#1352
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Link: https://tools.ietf.org/html/rfc6275#section-7.2 Fixes: f3b1a28 ("add mobile-ip6 option handling.")
This is a 1-bit flag in the Prefix Information RA option defined by RFC9762. If a compliant RA-accepting node receives a PIO with the P flag set, it is expected to make use of DHCPv6 Prefix Delegation to obtain a prefix and assign addresses from that prefix, not individual addresses from the PIO-specified prefix. Link: https://tools.ietf.org/html/rfc9762 Link: https://tools.ietf.org/html/rfc9663 Link: https://www.iana.org/assignments/icmpv6-parameters/icmpv6-parameters.xhtml#ipv6-neighbor-discovery-prefix-information-options
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Do you have any packets with this bit set as a material for a new test? |
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To this day I have not had any practice with a working impl to capture real-life packets, unfortunately. I am aware that e. g. odhcpd have added support (openwrt/odhcpd#301) for this RA PIO flag in their RA sender, so that functionality might be available in a recent OpenWRT release. I'd be happy to add a test if someone else (or me) manages to provide some captured packets. |
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This is a 1-bit flag in the Prefix Information RA option defined by RFC9762.
If a compliant RA-accepting node receives a PIO with the P flag set, it is expected to ignore the A flag, if set, and make use of DHCPv6 Prefix Delegation to obtain a prefix and assign addresses from that prefix as described in RFC9663, not individual addresses from the PIO-specified prefix.