If I have a bunch of sites and they are all on the same IP (dedicated IP). And one of those sites has been hit by Google sandbox effect. Can this have effect on other sites on the same IP? If so, what would be the protocol to deal with this? Use Google Disavow tool and be it? Hmmm
This is a bit outdated but I believe it is still relevant and hope it helps, http://wpengine.com/2013/02/20/the-myth-of-the-dedicated-ip-address-for-seo/