DLINE <nick|ip> :[reason]

Adds a DLINE to the ircd.conf or klines.conf file
which will deny any connections from the IP address
of the banned client.  The banned client will receive
a message saying he/she is banned with reason [reason]

In order to use <nick> rather than <ip>, <nick> must
be on your server.

- Requires Oper Priv: K