no-ip.org is a dyndns hostname - is your IP dynamic? - that sounds like a consumer grade internet connection to me, whois of current ip matches that assumption
http://whois.domaintools.com/87.251.143.28 - i'm not aware of any explicit rule but i'd assume that having a non-static IP is less than desirable?
have you checked to confirm that serving content in this manner is not against your terms and conditions as a broadband customer
also pretty certain that the speed might be too low for a mirror as theres already 8 Tier 1 (>OC3) mirrors in Russia
it might be better running a torrent seed for centos with that connection however