Linux - NetworkingThis forum is for any issue related to networks or networking.
Routing, network cards, OSI, etc. Anything is fair game.
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I have a need to determine the secondary (and even alternate) nameservers that are provided by my (or any) isp. These are returned, of course, when a DHCP request is made, however I want to be able to query for these in cases where the nameservers are not known and where I am not making a DHCP request. (In my particular case, I'm working on an embedded project which in some cases will act as a NAT router (between customer internet modem and another router or standalone equipment). In cases where my device has a static address on the wan side, i don't want to burden a customer with having to make dns ip entries, etc.
nslookup does a nice job of returning the (assumed: primary) nameserver that was used in the lookup request. Example: