Block IP address

[mjbarnard]

I apologise if this is seems a very basic question.

I have a 7800DXL which is connected to two servers, one running 2012 essentials and one running 2012 storage server. I configured them myself and they have been working fine for the last few years. I run my own mailserver on one of them. So I understand my way around the servers and the router.

I have been subject to dictionary attacks from a specific IP address. I would prefer to block that IP address in the router rather than on the servers or the rest of the network (although it is small - a home office setup). I simply cannot find out how to do this.

Please could you advise how to completely block a specific IP such as x.x.x.238? On all ports.

Thanks.

[billion_fan]

Try following the attached screen shot