[44net] strange login attempts to AMPR Hosts

Hi group The mikrotik router log show me every half minute a telnet and SSH login attempt it last for hours the strange thing is that the IP it is using was not active in the AMR DNS up to yesterday and right after i have add it to the DNS and connected the router the login attempt tried I have traced two off the breakers and one is in Poland and other is in China Is it common that someone try to brake our network hosts ? do you see such things at your hosts too ? how someone discover so quick about an active host in a Whole class A network ? What is your solution \ reaction for such a brake attempts ?? Thanks for every clarifications Regards Ronen - 4Z4ZQ http://www.ronen.org Ronen Pinchooks (4Z4ZQ) WebSite<http://www.ronen.org/> www.ronen.org ronen.org (Ronen Pinchooks (4Z4ZQ) WebSite) is hosted by domainavenue.com