If the school or company transfers boardband,
1. To update the domain IP (you can also transfer the domain to the new ISP company, if you need the HKDNR login name and password, you can ask the old ISP, namely the boardband company or the domain name administrator for it), this part is the most important, Usually, the new Internet company will have a special person to assist, and will also notify you to prepare this part and then choose a time to transfer to the Internet once. Just a reminder that DNS updates usually have a 24 hour delay. (There will be 00 two-party rental agreement, 01 IP quantity application form, 02 DNS List Update form and many other forms to be filled out, in addition, the old ISP needs to apply for deactivation, otherwise it will continue to pay, and a reasonable budget for deactivation time is required)
2. The firewall of the school or company needs to change the outgoing IP and DNS. If other servers go out directly, also need to change the corresponding outgoing IP and DNS.
3. Try to switch to boardband on Saturdays or during the teacher's holiday. (Someone will install the optical fiber and modem in advance, and test whether the Internet is normal).
4. Communicate more with new network providers and update progress.