When a domain name system (DNS) query returns two different IP addresses for a given hostname, such as a firewall distributing network traffic, this indicates the presence of multiple network interfaces or redundant server configurations. For example, a user might configure their network to use a specific firewall for DNS resolution, and querying the hostname of that firewall might return both its WAN (public) and LAN (private) IP addresses. This dual response is typical for devices offering diverse network connectivity.
Understanding the multiple IP addresses associated with a network device is crucial for network administration and troubleshooting. It provides insights into network architecture, load balancing strategies, and potential points of failure. Historically, DNS has evolved to provide redundancy and improve service availability. Receiving multiple addresses can signify a healthy, redundant setup, designed to maintain connectivity even if one interface or server becomes unavailable. This redundancy is a cornerstone of modern, reliable network infrastructure.
