strange behavior of shared network

[Simon Hobson]

Milan Kovac <kovac65 at gmail.com> wrote:
>Hi Guys,
>
>so the problem was:
>
>In subnet which is only for static clients, can`t be defined range.

You can have static and dynamic in one subnet - but the addresses cannot overlap.

>Now everything works correctly, but strange is, that  it worked 
>correctly 2 years, and when I added the last 11th subnet, problem was
>there.

It can happen.
Did any other subnets have the same overlap between statuc & dynamic clients ? If not, then you wouldn't have triggered the issue before.