After reboot, Nodegrid sends DHCP requests and wait up to 30sec to receive a lease from a server.
If that time expires (i.e. no lease assigned), Nodegrid assigns static IP 192.168.160.10 to eth0 or 192.168.161.10 to eth1 so the users have a way to access the interfaces.
The DHCP request automatically resumes after 5min, again waiting for a lease for 30secs. No need to bounce the link.
This cycle only stops after a lease is received, if the link is down, or if the interface is reconfigured to any mode other than dhcp.