The only half decent software that is cheap and works on 64 bit I have found is blue iris, I am monitoring 17 dlink camera 6620s and 5220s, 5 at one location, 2 at another and 10 at another. Only problems I have is they want to reset or something sometimes, I see them spin around. Not sure why the occasionally do that.
I can block the incoming connection my dad who is also looking at all these from another location here where my 2 cameras are and they dont reset or spin around. At his house there are 2 6620s that want to spim around all the time, if I disconnect from them there work fine.
I have all set up on different ports, different IP address etc. They work fine other the occasion reset or camera spins around, only 4 that do this, 2-6620 and 2-5220...