I am planning to move several websites to a new hosting provider - keeping the same URL but will resolve to different IP addresses.
For example, some sites are Canadian content-only sites, hosted on .CA domains sitting on Canadian IP addresses. I want to move these to Amazon servers which have US IP addresses.
The domain names will remain the same.
(1) What is the SEO impact of this?
(2) Will the site lose some ranking if the sites are moved to a new IP address (Canadian or not), and if so, what is the cleanest way of accomplishing this (some kind of 301's)?