On 06/01/2022 00:05, Eric Dittman via Dnsmasq-discuss wrote: > On 1/5/22 4:57 PM, Simon Kelley wrote: >> On 03/01/2022 21:55, 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). >>> >>> Any ideas how I can get this working? >> >> The dnsmasq RA code was designed to work with the dnsmasq DHCPv6 server, >> so there's no direct support for this. I think the closest you can get >> is to configure a static-addresses-only dhcp range >> >> dhcp-range=2001:470:xxxx:10::,static,slaac >> >> Which will not allocate any DHCPv6 leases, leaving the field open for >> you other DHCPv6 servers, but will set the M and O bits. >> >> Adding a new keyword to cover this circumstance is pretty >> straightforward. > > Thanks, Simon, that worked! I really appreciate it. > > The only issue I'm having now is I'm getting the router link-local IPv6 > address included along with the two IPv6 addresses I specify in the > DHCPv6 options for the DNS resolvers: > > nameserver 2001:470:xxxx:10::105 > nameserver 2001:470:xxxx:10::106 > nameserver fe80::300d:e6ff:fe85:e6e0 > nameserver 10.0.10.105 > nameserver 10.0.10.106
Dnsmasq will include the router's link-local address as the DNS server IF no other addresses are configured with dhcp-option AND dnsmasq is configured to provide DNS. If your case, since you're not using dnsmasq for DNS, disable DNS by setting port=0 and that DNS server address will disappear. Cheers, Simon. _______________________________________________ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss
