I'm kind of baffled. It's probably some really stupid issue that I'm going to hang my head in shame over, but I really can't wrap my head around it.
I've got a postfix box. It's accepting external mail fine. [And has been for some time.] It's pointed at a couple of caching name-servers in the local network. Lets call them NS1 NS2. NS1 is primary and NS2 is secondary. Recently I noticed that when NS1 is down, postfix won't accept mail. Yet digs from postfix get handled by NS2 fine, while NS1 is down. [Just a plain dig, which uses NS2, when NS1 is down. Like so; dig some.f.q.d.n - and the results come from NS2, not NS1.] Yet, if I change things so NS2 is primary and NS1 is secondary and take down NS1, mail doesn't get interrupted. [And does if I take down NS2] Can someone give me some places to look that might yield some results? TIA -Greg
