Oracle Solaris 11.4 Tunable Parameters Reference Manual Internet Protocol Suite Tunable Parameters SCTP Tunable Parameters _rto_min Parameter _rto_min Parameter Description Sets the lower bound for the retransmission timeout (RTO) in milliseconds for all the destination addresses of the peer. Default 1,000 Range 500 to 60,000 Dynamic? Yes When to Change Refer to RFC 2960, section 6.3.1. Commitment Level Unstable