iptables: Distinguishing packets from bridge-nf-call-iptables

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I am trying to run two pieces of software X and Y on a linux box.

X assumes /proc/sys/net/bridge/bridge-nf-call-iptables is set to 1. I am not able to modify this.

Y assumes /proc/sys/net/bridge/bridge-nf-call-iptables is set to 0. This is my software and I can modify it.

I want to adapt my rules for Y so that it copes with /proc/sys/net/bridge/bridge-nf-call-iptables=1 by ignoring (in the iptables rule) any traffic which is purely bridged, and simply doing the ebtables rules on these packets.

In the iptables rules, how do I differentiate ip forwarded traffic from bridged traffic? The bridge interfaces may or may not carry IP addresses.

-- 
Alex Bligh




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