In addition to the key-value pairs accepted by the
           IO::Socket manpage, IO::Socket::INET provides.

               PeerAddr    Remote host address          <hostname>[:<port>]
               PeerHost    Synonym for PeerAddr
               PeerPort    Remote port or service       <service>[(<no>)] | <no>
               LocalAddr   Local host bind address      hostname[:port]
               LocalHost   Synonym for LocalAddr
               LocalPort   Local host bind port         <service>[(<no>)] | <no>
               Proto       Protocol name (or number)    "tcp" | "udp" | ...
               Type        Socket type                  SOCK_STREAM | SOCK_DGRAM | ...
               Listen      Queue size for listen
               Reuse       Set SO_REUSEADDR before binding
               Timeout     Timeout value for various operations
               MultiHomed  Try all adresses for multi-homed hosts