I am trying to troubleshoot an intermittent problem with the losing the WAN IP on the router - probably something I'm doing wrong with very short lease times/ switching WAN ISP, and my firewall script to patch half bridge gateway handling... The symptom is that the WAN IP is lost and RELEASE / RENEW from the WAN interface do not work. Rather than reboot the router (which works) I have found that the problem is that udhcpc is not running. I can get this restarted by switching the WAN config to static then back to auto dhcpc which fixes the problem. But isn't there a RAM file with system messages somewhere I can access to see if there any relevant messages? I'm sure I've seen it before /var/log ? - maybe older version of Hyperwrt Thibor?