iptables reporting incorrect eth0 data bytes on rt-ac66 router

[larry axtell]

I am using a script which relies on the iptables command to obtain byte count usage from the forward chain to report totals by device. When I get the wan directly from the isp modem it works fine. Sometimes I need to get my internet service from a 3g/4g modem though. I have tried to use the usb modem directly on the router and it locks up occaisionally so I purchased a cradlepoint router for the network source. It works reliably for me. I still need to get data usage statistics. I plugged the asus router behind the cradlepoint router. The networking part works just as if I were plugged direct into the isp modem. It works great just like an access point. The problem is it only reports a small percent of the actual data usage from the eth0. The ifconfig command reports the right counts as does /proc/dev/net (/sys/.........) . I have tested extensively from the command line playing with the rules and cant figure it out. What am I missing here? I need iptables to work because I can get stats by device.

 

[RMerlin]

The forward chain is bypassed when NAT acceleration is enabled. Disable it under LAN -> Switch Control.

 

[larry axtell]

Thank you so much for the reply. I love your posts. I don't know how you have time to do this. I will try that. I have an ASUS rt-ac66.

 

[larry axtell]

It Works!! You have no idea how much time you have saved me. I might have known you would be the one to solve this. I will figure out a way to make a donation. Keep up the great work.