I have intermittent problems with my dns resolution. Sometimes connection fails (and dig don't resolve too) to some nodes, other times to others, and WITHOUT ANY CONFIG CHANGE other times each one resolve correctly to IP.
The offending names are:
dallas1.fitsaas.com dallas2.fitsaas.com uk1.fitsaas.com uk2.fitsaas.com
How can I check my bind config on my dns servers (ns0-ns4.fitsaas.com) for validity?
When some name is failing, what tools among dig I have to test where is trying to resolve and why is not doing it?