openwrt-xburst/package/base-files/default/etc/sysctl.conf

kernel.panic=3
net.ipv4.conf.default.arp_ignore=1
net.ipv4.conf.all.arp_ignore=1
net.ipv4.ip_forward=1
net.ipv4.icmp_echo_ignore_broadcasts=1
net.ipv4.icmp_ignore_bogus_error_responses=1
net.ipv4.tcp_fin_timeout=30
net.ipv4.tcp_keepalive_time=120
net.ipv4.tcp_syncookies=1
net.ipv4.tcp_timestamps=0
net.ipv4.ip_conntrack_tcp_timeouts="300 43200 120 60 120 120 10 60 30 120"
net.ipv4.ip_conntrack_udp_timeouts="60 180"