With VPN configuration; it's necessary to have "Enterprise Domain Names" configured for DNS queries to be sent to Corporate DNS server. Without this configuration; all DNS queries would be handled by Instant's local DNS server and result in unreachability of internal resources when accessed using fqdn.
Note :: With the split-dns architecture; Aruba Instant AP must get DNS Server IP and should be able to reach the DNS server for external domains name lookup to work.
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