On Mon, Jan 20, 2020 at 8:28 AM Brian J. Murrell <br...@interlinx.bc.ca> wrote:
> I'm really not sure about what the name of this feature I am going to > describe would be. I would probably call it an "overlay view". But I > am sure there are better names. > > Imagine I have a BIND 9 server for the following network topology: > > > Network 1 > 192.168.1.0/24 ------------------------ > -------------------------|.254 | > | Router | > Network 2 | | > 192.168.2.0/24 | | > -------------------------|.254 | > | | > Network 3 | | > 192.168.3.0/24 | | > -------------------------|.254 | > ------------------------ > > There are a few dozen hosts/services on Network 3 which hosts from > Network 1 and Network 2 need to resolve names of. All pretty > straightforward. > > But the hosts on Network 1 and Network 2 need to resolve the same name > (let's call it "gateway") to the address of their interface on Router. > So that is, hosts on Network 1 want a query of "gateway." to resolve to > 192.168.1.254 and hosts on Network 2 want a query of "gateway." to > resolve to 192.168.2.254. > > So this is currently all achievable through "views" in BIND 9, but > requires that the zone data for each view be 98% duplicate (Network 3 > resources) and continually copy-n-paste updated whenever names on > Network 3 are added. > > What I am looking for is a way to save the duplicate copying of Network > 3 resources to the views for Network 1 and Network 2. This is where > the term "overlay" comes in. What I'd like to do is reference a single > copy of data from Network 3 in Network 1 and 2's views but "overlay" > some view-specific resources on top of that, namely the "gateway." > name, with it's per-view specific value. > > Thoughts? > > b. > > What I have set up, is for the few names that need to be different, use CNAME to a zone that is different in each view: This zone is same in all views: zone example.com host1.example.com IN A 10.0.0.4 host2.example.com IN A 10.1.1.7 router.example.com CNAME router.splitview.example.com Then in one view: zone splitview.example.com router.splitview.example.com IN A 10.0.0.1 And the other view: zone splitview.example.com router.splitview.example.com IN A 10.1.1.1 Any downsides that I have not thought about? -- Bob Harold
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