Hi to all,
I have this problem. I'm using an HUAWEI modem (installed on RB411 as an lte1 interface) and I receive on interface lte1 a dynamic ip address. The router run correctly but in certain condition I lose connection with routerboard and when it come back in the log I have a losed ip address on lte1 interface for the leasing time expiration. I called telecomunication provider and it tell me that probably there is some delay in dhcp message.
In this case I can create a script that periodically restart dhcp client for me: what is the difference in renew and release button in dhcp client?

Is it possible to configure a timeout on dhcp client to allowing correct dhcp message transfer also in delayed connection?
Thanks

Release will let the IP go without requesting a new address until the DHCP timers expire.

Renew will, well, renew the IP in one fail swoop.

I dont believe there is a specific timeout for DHCP client config in RouterOS. You are probably stuck with a script using scheduler.