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DNS stands for Domain Name System, which is a form of domain name resolution.

DNS maps static and easily human readable textual (rather than numerical) names to IP addresses. A domain name server resolves the text domain name to the appropriate IP address. For example, entering "ping" in the command console of a desktop computer will show a ping request being sent to the IP address (at the time of writing - the IP address may change) because a DNS server resolved the string "" to the IP address

If ipconfigUSE_DNS is set to 1 in FreeRTOSIPConfig.h then the FreeRTOS+TCP API function FreeRTOS_gethostbyname() can be used to resolve a text name to an IP address.

Like the IP address of the node running FreeRTOS+TCP, the IP address of a domain name server can be configured either statically as a parameter to FreeRTOS_IPInit(), or dynamically from a DHCP server.

Useful links:

Other networking basics pages:

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