Hi,The router is dropping relay replies from dnsmasq because it sees the Option 79 with lenght of 0 as invalie, i.e less that minimum length.
I have attached a pcap file showing that the reply from dnsmasq does include Option 79 with len == 0.
RFC6939 - 6. DHCPv6 Server Behavior """ There is no requirement that a server return this option and its data in a downstream DHCP message. """I think we want to either copy all of the option data from the Relay-forward message, or simply drop the entire option in the reply?
-- Harald Jensås
invalid-option-79-length-zero-in-relay-reply.pcap
Description: application/vnd.tcpdump.pcap
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