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25.3.4. About Amazon EC2 and DNS
JON servers and JON agents need to be able to resolve each others' hostnames. The DNS resolution is more complicated in the case of a VPN configuration. Connected servers have multiple possible options. One option is to use either the Amazon EC2 or the corporate network's DNS servers. Another option is to use a split DNS configuration where the corporate DNS servers are used for resolving names in particular domains, and the Amazon EC2 DNS servers are used for resolving all other names.