Hi, I use DNSmasq to provide DNSH/DHCP to multiple subnets and have many with hosts which are multihomed in several of these subnets. The dnsmasq servers themselves have an interface in all subnets. If a client looks up a hostname for a host not in its primary subnet, it gets a list of all addresses for that host in a random order. Is it possible instead to specify an address/subnet as the "best" one for a multihomed host? So that instead of getting all addresses when the host is not in the client subnet it could be limited to a single address/subnet? In my case this would be the external facing one for which I know there is an allowed network path to reach.
As an example, I have two clusters managed this way, they are not allowed to speak to each other over the private internal trusted cluster network but can by traversing the external facing firewalls for each. If I look up my login nodes on cluster A from a node in cluster A I correctly get the internal private cluster addresses: [griznog@smsx10srw-srcf-d15-36 ~]$ host login login.clusterA has address 10.1.1.6 login.clusterA has address 10.1.1.8 login.clusterA has address 10.1.1.7 login.clusterA has address 10.1.1.9 But if I look up login nodes for A from cluster B which has no access to Cluster A private subnet I get [griznog@smsx11qph-srcf-f5-09 ~]$ host login.clusterA login.clusterA has address 10.1.1.7 login.clusterA has address 22.214.171.124 login.clusterA has address 126.96.36.199 login.clusterA has address 10.1.1.8 login.clusterA has address 10.1.1.9 login.clusterA has address 188.8.131.52 login.clusterA has address 10.1.1.6 login.clusterA has address 184.108.40.206 What I'd like to be able to do is make that return only the external facing addresses, e.g., login.clusterA has address 220.127.116.11 login.clusterA has address 18.104.22.168 login.clusterA has address 22.214.171.124 login.clusterA has address 126.96.36.199 All hosts use the dnsmasq interface in their respective private subnets to do name lookups. I think what I want to be able to do is somehow "rank" a subnet so that if a request comes in for an address and there isn't an answer in the available subnet only the first and highest ranked subnet will get returned. Is this (or another method of handling this) possible? Best, griznog
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