nameserver move caused loss of rankings

Disapeared from search engines after switch to new nameserver

[vim108]

Ive got another post up about moving nameservers. and good feedback from jatr and wildbest..anyway I need to move a site but
Earlier this year I moved a much bigger and important site from the same above mentioned host...This site virtually dominated yahoo and msn for our many keywords and was coming up nicely on google.

However, as soon as we switched host we disapeared from all search engines for months...it was a disaster. It took google ages to reindex our pages...now we are back on top at yahoo...not showing well on msn and on google...well they have finally, recently indexed 1000's of pages..but it was a set back of about 4 months.

Does anyone know why this might happen and if or how we can avoid it happening again when we move the other site...thanks

[jtara]

As I suggested on the other thread, look for whatever ELSE might have changed, other than the IP address. Moving from one server to another is seldom a seamless process of just moving all the files over as-is.

Here's one more possibility: reverse DNS. Dunno if Google uses it. But make sure that the reverse DNS for the IP points back to your domain name. Probably NOT an issue, because of the many, many websites on shared IPs.

But who knows - perhaps you have just proven the oft-repeated myth about shared IPs being a penalty.