Hi Guys,
I hope you don’t take any of my comments the wrong way if I disagree with any of them. I’m really not meaning to be argumentative, just state the facts when and IF I know them.
Anyhow, dynamic IP’s are handled no differently than dedicated (unlike in the past) servers with one exception; If the server is overloaded and therefore slows your site down, potentially enough to serve a load error, then this may affect your rankings.
Bad neighbourhoods refer to this statement by Matt Cutts, ” If your sister companies are just linked at the footer of the page, in hopes of cross-advertising or getting more links, it’s not likely to add value to ranking or the user. In extreme cases, if it’s a bad neighbourhood, these links will certainly not help you.”
Its been a widely used piece of advice in the past when spammers or blackhat style sites (malware) were being targeted, but since then Google has figured out how to identify and filter these. But these days you are safe on dynamic and shared servers.
GaryTheScubaGuy