How to filter the traffic

Installing and Using OpenWrt
1

In my router, br-lan receives wlan and eth packets, I want to drop the incoming eth packets in mangle & nat table or filter table.
bypass ethernet packets

iptables -t mangle -A TPROXY -p udp -s ${IP_RANGE} ! -d ${IP_RANGE}
--match multiport ! --dports ${UDP_NON_INTERCEPT} -j REDIRECT --to-port 1228

iptables -t nat -A NATTCP -p tcp -s ${IP_RANGE} ! -d ${IP_RANGE}
--match multiport ! --dports ${TCP_NON_INTERCEPT} -j REDIRECT --to-port 1226

In this Iptable command want to pass only wlan packets

2

for packets coming from specific interface, you need to add -i in these rules

3

Hi laiba , since both ethernet and wifi packets are via br-lan , how can we specify -i interface which will only pass the wlan packets?

4

did you test these rule? what is the output?

5

Yes i did . I'm receiving both ethernet and wlan packets. Ex: If i did iperf transfer in wired mode that is also seen in 1226 port. But here i don't want the iperf to be redirected to 1226 and want to bypass any ethernet traffic

And i cannot specify -i br-lan as this will receive both eth and wlan interfaces packets.

6

Its your problem solved?
if not, then you can try it with IP and add rules which traffic you want to redirect.

7

ip command will print the br-lan interface, it will not give the actual interface from where the packets are coming it ex from wlan or ethernet