Have a question, my company is switching over from an old network service provider Verizon to ATT and has been assigned to prepare a checklist what needs to be monitored and/or done. The switch over will be done per location. I have the following ideas as enumerated below but would like to find out if you have any suggestions, inputs and recommendations to handle this switch over safely and in a most efficient manner. I'm a systems admin person and routing and networking are not my strongest suit, so your input would be much appreciated.
If there are any components that I might have missed, please let me know also.
My Idea: I'm thinking that the external network should be the (only) major concern and internally everything should be unaffected. We have to ensure that the external DNS record will be updated to the new service provider's IP address (which is handled by the vendor). That being said, internally, I think the IP address update should only be done in the email, vpn settings, firewall and external sites areas (ie, such as www.company.com
dns record and ftp sites' dns records to reflect the new service provider's IP address. Is there something that I'm missing? And, are there internal components (ie, Active Directory, DNS..etc) that I need to worry about? Would like to find out if this turn over will also impact Active Directory or the internal components in our environment.
Appreciate all of your input on this.