Originally posted by FHDave
By Class C you mean a /24 right? So you are trying to block 18.104.22.168/24 ?
0.0.0.255, unfortunately, is not a class C's netmask. Aren't you blocking a lot more than just a class C with that netmask?
It's already blocked, via an access-list in Cisco ios, you would do this in conf mode by typing: access-list 101 deny ip x.x.x.x y.y.y.y any
Where x.x.x.x = the ip to be blocked & y.y.y.y = the block
Where #.#.#.0 0.0.0.255 would be a class c and #.#.0.0 0.0.255.255 would be a class b
If only the isp's would block the unnecessary outgoing traffic for me =)