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I have a setup at home as follow:

DHCP clients  -----> (wifi)(bridge) Openwrt -----> (eth)Main Router

The device I'm using is TPlink MR3020 with Barrier Breaker and I tried to set up transparent proxy for bridge traffic - I want to redirect the packets passing through the bridge to proxy server(privoxy). I tried to use ebtables. But when I enter the following command:

ebtables -t broute -A BROUTING -p IPv4 --ip-protocol 6 --ip-destination-port 80 -j redirect --redirect-target ACCEPT

I got following error:

Unable to update the kernel. Two possible causes:
1. Multiple ebtables programs were executing simultaneously. The ebtables
userspace tool doesn't by default support multiple ebtables programs running
concurrently. The ebtables option --concurrent or a tool like flock can be
used to support concurrent scripts that update the ebtables kernel tables.
2. The kernel doesn't support a certain ebtables extension, consider
recompiling your kernel or insmod the extension.

I tried to activate the IPv4 package with insmod, but no luck.

Any ideas on how to accomplish this?

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That error message usually results from missing kernel modules. The correct syntax and order for loading the ones you need should be:

insmod ebtables #load ebtables

insmod ebtable_filter #load filter table [ not strictly necessary ]

insmod ebtable_broute #load broute table

insmod ebt_ip #load ip filtering

insmod ebt_redirect #load redirect

lsmod #check that they are active

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  • Thank you, but there is no luck. I tried to do what you said, but I take Failed to find ebt_ip. Maybe it is a built in module ? error. I tried to find this module before, but I couldn't find. Do you know how can I overcome this error ?
    – Enes Aldemir
    Commented Apr 30, 2016 at 7:22
  • If you see it in the output of find / -iname "*ebt*" then you can insmod with full path. If it is not there you need to find the appropriate module for your kernel and add it manually.
    – codemonk113
    Commented May 1, 2016 at 15:45

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