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In previous releases, SBC supported all DNS queries over UDP from the DNS client with no option to configure the transport protocol for DNS servers. SBC is enhanced in this release to provide support of DNS servers over TCP by the addition of transportProtocol configuration object with two options: udp or tcp. Default value is udp. Additionally, the flag tcpFallback is added to support TCP fallback when the configured protocol is UDP. Default value is disabled.
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For configuration details, see:
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Configuration of Transport Protocol
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SBC is able to override the TTL value with the new value if the matching FQDN and record type is found in the given DNS Group. If that FQDN value is not matching, it returns an error.
Manual DNS Query
SBC is enhanced to perform a manual query where the cache receives updates of the IP address, TTL and port received in response to the query sent to the server. The response is updated if record is already present; otherwise, SBC creates a new entry.
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Overview
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