I enabled dns clusering in cpanel for a few boxes. I some ample customers using various nameservers. I wish for them all to use ns1/ns2 instead of the others such as ns19/ns20 for example. If I contact them and ask them to update their nameservres to ns1/ns2.hostdomain.com would they face downtime? Would I have to do a mass modify of dns zones to replace say ns19/ns20 with ns1/ns2? I have all servers on synchronize mode too I tried one domain. dnsstuff.com shows Error: It looks like you've stuck me in a loop!. Why?