Network routers play a key role in modern network communications and are attractive targets to attackers. By mistakenly forwarding, dropping, eavesdropping or modifying packets, malicious routers are great threat to network communications. Most papers emphasize particularly on securing routing protocols. In this paper, we present a protocol providing securely data packet forwarding with Byzantine robustness. The protocol has low overhead, low processing requirements and can detect misbehavior quickly. Through the simulation, our protocol increases throughput by 10% in the presence of 10% malicious nodes, and by 19% in the presence of 20% malicious nodes. Also, due to the authentication method, our protocol is suitable for wireless Ad Hoc networks.