It is possible. All discovery communication is through ZooKeeper, but yes private docker IPs (172.. ) might be leaked over. Would need to see the full logs(Ignite and Zookeper) which contain the IPs of the node and the particular one used for a given communication. Try running docker w/--net=host first to get everything working (take a look at the logs to see what is happening in this scenario) and then go back to working w/the bridged network.
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