I've got this strange problem with my cisco 871 router. The ISP provide my Internet thought pppoe, which I don't know it it has anything to do with my problem.
The problem is that 2 of my home computers (running Windows XP SP3) can't access some internet sites (like www.yahoo.com, www.abv.bg) and may be others. In the same time I am able to open these sites with my laptop running Windows Vista.
The ping and telnet to port 80 to these sites shows no problem from all computers.