How to automate DHCP IP renew on the WAN interface

Question

I have a problem with my SG125 WAN interface losing the DHCP IP provided by the ISP regularly overnight. 
 What I do so far is to login to the GUI and clicking on the RENEW button on the Interface page which solves the issue. 
 
 Unfortunately this does not work when I am not at home and therefore I am looking for a solution to automate this to happen at 4AM daily. 
 
 Any idea how I can achieve this? Cron Job? 
 
 Looking forward to any cool recommendations. 
 Urs

BAlfson · Answer

If selecting the 'Daily reconnect' in the 'Advanced' section of the Interface definition doesn't do this, you can add a line like the following to /etc/crontab-static (using REF_IntPpps XXXXXX , as in Giovani's post): 
 0 4 * * * root /usr/local/bin/confd-client.plx interface_dhcp_renew_lease REF_IntPpps XXXXXX 
 I note that your logs are for almost 6AM, so you will want to check with your ISP to see what time they reset the connection. I agree with Giovani that the cause of the problem seems to be in their device. 
 Cheers - Bob