Mirror network packets from WiFi to Ethernet in an ASUS Router RT N53

Posted by fazineroso on Server Fault See other posts from Server Fault or by fazineroso
Published on 2013-10-23T15:22:07Z Indexed on 2013/10/23 15:56 UTC
Read the original article Hit count: 199

Filed under:

firewall

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wifi

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linux-networking

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bridge

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sniffer

I have an ASUS RT N53 router, running the default firmware (Linux 2.6.22 with busybox and uclibc). I need to capture data packets from some Wi-Fi devices I have connected to that router (iPad and some smartphones), but the router is not forwarding any package coming from Wi-Fi devices to the Ethernet Ports. Any idea how can I proceed? Available tools in the router are iptables (no tee option, though), ebtables, brctl...

Currently the ethernet and Wifi devices are forming a bridge:

# brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.50465dc06be2       no              vlan0
                                                        eth1

No ebtables rules:

# ebtables -L
Bridge table: filter

Bridge chain: INPUT, entries: 0, policy: ACCEPT

Bridge chain: FORWARD, entries: 0, policy: ACCEPT

Bridge chain: OUTPUT, entries: 0, policy: ACCEPT

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