[Dnsmasq-discuss] DHCPv6 - Relay-reply dhcpv6.option.type 79 Client Link-Layer Address with zero length

[Simon Kelley]

Is dnsmasq acting as the relay or as the DHCP server in that pcap?

Simon.


On 10/02/2023 17:01, Harald Jensas wrote:
> 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
> 
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