If we do the directory submission, bookmarking submissions on the same IP address websites, then is it effects to current rankings or not. Is it spaming ? Please discuss your views here. Thanks in advance.
You can do directory submissions for different websites even if they are on the same IP. This is perfectly fine. The problem is that if one of the sites with the IP does black hat SEO (buying text links, having links in bad neighborhoods, etc) then the other sites on the same IP can get penalized as well. Additionally, if the sites are linking to each other, it might not count as much towards page rank.