for days, hours, minutes, or seconds respectively; if no suffix is
given, seconds are assumed.
.TP
+.BI "\-key " tag
+Use the public key
+.I tag
+to authenticate the peer. The default is to use the key tagged
+.IR peer .
+.TP
.BI "\-tunnel " tunnel
Use the named tunnel driver, rather than the default.
.\"-opts
.B keepalive
The keepalive interval, in seconds, or zero if no keepalives are to be
sent.
+.TP
+.B key
+The key tag being used for the peer, as passed to the
+.B ADD
+command. (You don't get a full key-id, since that might change while
+the daemon's running.)
.RE
.SP
.BI "PING \fR[" options "\fR] " peer