[hcvv]

I know one thing for sure: this can not be resolved by doing something to resolv.conf. In resolv.conf the second (and further) servers are only mentioned for the case the first does not answer. All servers mentioned there are supposed to give the same information.

IMHO you can not have two seperate DNS worlds on one system. Normally you use your local DNS server (which has the zone files for your subdomains) and it points to the ouside DNS server(s) for all other information. So when you ask for forums.opensuse.org, you go to your local DNS server, which will forward this question to the DNS server of your ISP (or another one on the Internet).