This read-only object reports which algorithm this virtual router's TCP stack uses to compute the retransmission timeout for unacknowledged segments, one of other, constant, rsre, or vanj. Knowing the algorithm matters to an administrator diagnosing TCP performance issues on management or tunnel sessions terminated on the virtual router, since different algorithms behave differently under congestion or high-latency links. For example, an engineer checks csOrionVPNVRouterTcpRtoAlgorithm and finds it reports vanj, confirming this VPN virtual router uses the Van Jacobson-style adaptive RTO algorithm rather than a fixed constant timeout.