[Dnsmasq-discuss] dnsmasq and external DHCPv6 servers

[Eric Dittman]

On 1/3/22 5:14 PM, Geert Stappers via Dnsmasq-discuss wrote:
> On Mon, Jan 03, 2022 at 03:55:18PM -0600, Eric Dittman via Dnsmasq-discuss wrote:
>> I have a Ubiquiti UDM SE.  It uses dnsmasq for DNS, DHCP, and RAs.  I
>> have external DNS and DHCP servers so I want to send RA packets with
>> the M and O flags set and the A flag reset, but I can't figure out the
>> proper configuration to do that.  Right now just to get RA working on
>> the subnets for IPv6 I have the following:
>>
>> enable-ra
>> ra-param=*,high,0
>> domain=mydomain
>> dhcp-range=2001:470:xxxx::,ra-names,slaac
>> dhcp-range=2001:470:xxxx:10::,ra-names,slaac
>> dhcp-range=2001:470:xxxx:20::,ra-names,slaac
>> dhcp-range=2001:470:xxxx:40::,ra-names,slaac
>>
>> I'm getting autoconf IPv6 addresses but I'm not seeing any DHCPv6
>> packets on the external DHCPv6 servers (a pair per subnet).
> 
> Sounds like "I want dhcp-proxy for IPv6"
>   
> 
>> Any ideas how I can get this working?
> 
> Start with research if "DHCPv6" has such feature.

With IPv6 if the RAs have the M flag set the client will request an
IP using DHCPv6.  Right now the RAs I'm getting from dnsmasq don't
have that flag set so I'm only getting autoconf IPs.

-- 
Eric Dittman