Install dnsreg on xymon server

 
Hello, 
We would like to install the dnsreg script on my xymon server, not on
client side, should be from server side, somebody can help me?, i have
the script and i move to /home/xymon/server/ext, then where i need to
fill with this lines?: 
[dnsreg]
 ENVFILE $XYMONHOME/etc/xymonserver.cfg
 CMD $XYMONCLIENTHOME/ext/dnsreg.sh
 LOGFILE $XYMONCLIENTLOGS/dnsreg.log
 INTERVAL 5m 
By other side, this lines is correct? 
Thank you very much.