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You can set an alternate network ISP's DNS in the tcpip properties on the NIC properties.
The registrar for your domain has a variety of information about the domain, including the name servers for the DNS service for the domain.
That would cause all queries to the old server to still return the proper results and after a few days you would be free to remove the reverse proxy.To determine whether the registrar is using the name servers for your Route 53 hosted zone and, if necessary, to update the name servers for the domain, perform the following procedure: To get the name servers for your hosted zone and update the name server setting with the domain registrar Important When you change the name servers for the domain to the name servers from your Route 53 hosted zone, it can take up to two days for the change to take effect and for Route 53 to become your DNS service.This is because DNS resolvers across the internet typically request the name servers only once every two days and cache the answer.Until the amount of time that is specified by the TTL passes, DNS resolvers will continue to return the old value in response to DNS queries.
If you want to know what the TTL is for a record, perform the following procedure.
These name servers tell DNS where to get information about how you want traffic for your domain to be routed, for example, to the IP address of a web server for your domain.