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Relation between SOA and NS
Hello all,
I am currently playing a bit with DNS and I was wondering something that DNS gurus might answer.
We often see that the SOA server is one of the servers listed in NS, but is it possible that it is not ?
Then the situation would be: a SOA server hold the DNS records but is not queried by the clients, it only transfers the zones to secondary DNS servers which will serve the clients (resolvers).
You can then rely on powerful DNS infrastructures while having your server which can be slower out of the equation.
Is such thing possible or not ?
Ed
Comments
You can do something like this.
Create 3 NS ns0, ns1, ns2.
make ns0 with SOA record,
setup cluster between ns0,ns1,ns2 and
just use ns1 and ns2 for the domains.
No. SOA must list the primary NS name. If you want something powerful in the background use solid, anycast infrastructure
So the SOA is necessarily one of the NS ?
According to the RFCs - yes. Although technically it works even if a totally different name server is specified in the SOA. However many DNS checking tools like http://intodns.com will complain then and will tell you that you have errors.