Hi,
        I'm new to OperWrt packages and started using the firewall-2017-11-07-c4309372.tar.xz  from sources.openwrt.org. i have cross compiled the package for mips-linux and loaded the binary on to my router, but when i started it, iptable rules were not formed with following warning..
[root@DPU504G_BCM380 config]# firewall3 start
* Populating IPv4 filter table
   * Zone 'lan'
   * Zone 'wan'
   * Rule 'Allow-Ping'
   * Rule 'Allow-DHCP-Renew'
   * Rule 'Allow-IGMP'
   * Forward 'lan' -> 'wan'
Warning: iptc_commit(): No chain/target/match by that name
* Populating IPv4 mangle table
   * Zone 'lan'
   * Zone 'wan'
Warning: iptc_commit(): No chain/target/match by that name
* Set tcp_ecn to off
* Set tcp_syncookies to on
   ! Unable to write value: No such file or directory
* Set tcp_window_scaling to on
can someone give me any suggestions to resolve this issue..