This document proposes a mechanism called Enhanced OLSR (EOLSR) to secure the optimized link state routing (OLSR) protocol against denial-of-service (DOS) node isolation attacks in mobile ad hoc networks. EOLSR verifies hello packets from neighbor nodes to detect malicious nodes launching node isolation attacks. Experiments show EOLSR achieves a 45% increase in packet delivery ratio and 44% reduction in packet loss compared to standard OLSR under attack, with low computational complexity.