Proxy relaying is the practice of forwarding traffic through an intermediate device so the original source, destination, or path is harder to see. The relay may be a legitimate proxy server, a misused router, or a compromised host. In security terms, it is a way to separate the attacker from the final target and to make tracing, blocking, and attribution more difficult.
Proxy relaying matters because it turns ordinary network equipment into stealth infrastructure. Attackers use it to hide command-and-control traffic, bounce scans through trusted IP space, or route stolen data through another host. Defenders look for unusual outbound connections, devices acting like transit points, and systems that suddenly accept or forward traffic they should never handle. Hardening exposed services, restricting administrative access, and monitoring egress patterns help reduce relay abuse.