Are links from the same IP discounted?

[MrSpeed]

I had a few sites go up in serps and some down. One of the reasons I'm exploring is links from the same IP being discounted.

Anyone else notice this or have theories?

One the caveman level it does seem like a pretty reasonable signal of quality.

[experienced]

same Ip with site linking is almost discounted.

anyone else

[Dav58]

IMHO links from the same ip are discounted as its a simple way to stop low budget link farms.