+If the
+.Fl -logfile
+option is used, this will also close and reopen the log file,
+useful when log rotation is used.
+.It INT
+Temporarily increases debug level to 5.
+Send this signal again to revert to the original level.
+.It USR1
+Dumps the connection list to syslog.
+.It USR2
+Dumps virtual network device statistics, all known nodes, edges and subnets to syslog.
+.It WINCH
+Purges all information remembered about unreachable nodes.