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

[Harald Jensas]

On 2/11/23 23:39, Simon Kelley wrote:
> Is dnsmasq acting as the relay or as the DHCP server in that pcap?
> 
> Simon.
> 

dnsmasq is acting as the DHCP server in the attached pcap.


--
Harald

> 
> 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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> 
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