Well I spent a few hours yesterday trying to figure out why DNS was failing in some cases.
We use OpenDNS server then fallback to googles.
Yesterday nslookup test.uribl.com.multi.uribl.com failed.
After a while I found the following …
OpenDNS server returns server unknown :
nslookup test.uribl.com.multi.uribl.com 184.108.40.206
** server can't find test.uribl.com.multi.uribl.com: NXDOMAIN
While google works correctly :
nslookup test.uribl.com.multi.uribl.com 220.127.116.11
I have now switched to use google DNS only. I have no idea why OpenDNS fails for this lookup but not any other.