Let's say i have two websites (site A and site B) hosted on the same server, so both have the same ip address. I also have same adsense and analitycs account on both on them. Basicaly Google knows for sure that I own both sites If i link from site A to site B will Google consider this as some kinda spam link, irrelevat, etc and it will penalize me? Thanks!
it won't penalize you, you have the right to own two websites and interlink them, now if u had 100, 200 or 300 sites, that would be another story, but two interlinked sites belonging to the same person is legitimate and usual.
No, you will not be penalized for that. Most likely, G will look at both as being two parts of one website. I have a mini-network of sites. G seems to consider them all one large site. /*tom*/
you wont get penalized. i would suggest not to do sitewide links. from my experience link from a single related page works better.
Of course you have the right in the link between more than two site and not only because of AdSense that move in more than one site as long as the ID number and a Publisher
You will not be penalize by doing it. But if you do more backlinks for each website make sure they are not in the same keyword so it will not look like spam in google since you are using the same IP.
You can surely interlink just 2-3 sites with each other for the reason of traffic equilibrium, moreover if they are on same topic then its more than fair but if you are planning for a network of sites, then it definitely gets seen as spam.
I think it is a bit of an unknown because of the AdSense, but one of my main competitors has links to his site coming only from other sites. He's in the top 3 for some very competitive search terms. Please note, those other sites have plenty of links going to them from outside.
I do agree with the older answers because it is not against the rules and you can have two sites on a same server, so feel free to use them.
No its not bad. I also linked my sites with each other. You can see that all big networks of websites also link their sites with each other. Dont worry about that.