I do not have a variable "tcp_ecn" in /proc/sys/net/ipv4. The listing of that directory is as follows:
conf icmp_destunreach_rate icmp_echo_ignore_all icmp_echo_ignore_broadcasts icmp_echoreply_rate icmp_ignore_bogus_error_responses icmp_paramprob_rate icmp_timeexceed_rate ip_always_defrag ip_autoconfig ip_default_ttl ip_dynaddr ip_forward ip_local_port_range ip_masq_debug ip_masq_udp_dloose ip_no_pmtu_disc ipfrag_high_thresh ipfrag_low_thresh ipfrag_time neigh route tcp_fin_timeout tcp_keepalive_probes tcp_keepalive_time tcp_max_ka_probes tcp_max_syn_backlog tcp_retrans_collapse tcp_retries1 tcp_retries2 tcp_rfc1337 tcp_sack tcp_stdurg tcp_syn_retries tcp_timestamps tcp_window_scaling Donald Daniel 806-799-4443
