root@OpenWrt:~# cat /etc/sysctl.d/11-nf-conntrack.conf
# Do not edit, changes to this file will be lost on upgrades
# /etc/sysctl.conf can be used to customize sysctl settings
net.netfilter.nf_conntrack_acct=1
net.netfilter.nf_conntrack_checksum=0
net.netfilter.nf_conntrack_tcp_timeout_established=7440
net.netfilter.nf_conntrack_udp_timeout=60
net.netfilter.nf_conntrack_udp_timeout_stream=180
There is no related configuration item in the file /etc/sysctl.d/11-nf-conntrack.conf.