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The output of "bridge fdb show" command invoked under a network namespace is unpredicable. Sometime it returns empty, and sometime non-stop rolling output. This perhaps is a bug in kernel and/or iproute2 implementation. To work around, display fdb for each bridge. Signed-off-by: Su Wang <su.wang@docker.com>
Usage: docker run -v /var/run:/var/run --network host --privileged dockereng/network-diagnostic:support.sh