ipfw secure setup for ssh bruteforcers

[Olivier Nicole]

> admin said that doing this can be bad, especially when
> the kiddy is connected to a large network like a company or university; I
> may block other people who aren't guilty of the act. (which makes sense)

I know I have no problem with blocking one IP from a larger network,
nor even blocking the full block.

That can help to raise awarness in that block that they have miss
behaving users.

Bests,

Olivier