1. How to make client from DynDNS to inform the server about an ip change?
But it turns out that address has changed, and that DynDNS found out about it, it is necessary to click in the client Refresh IP, which is inconvenient since there is no automation.
Customer use, because the modem support DynDNS, no.
2. Whatever dns on the computer to get the latest information, because the provider up to a week for updates.