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Mohammed Noureldin
Asked: 2017-01-12 02:31:41 +0800 CST

Incomming connections have Docker host's IP address instead of the source's real IP when binding host's port to Docker container

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I am running some services on some different Docker containers. As a simple example:

docker run -it -p 123:123/udp ubuntu /bin/bash

this -p 123:123/udp causes that all incomming connections to my container to have the IP address of Docker container's host and NOT the source's real IP (I don't know if it is important to mention that I am using udp).

How can I make the incomming connections to have their real source IP address?

networking nat iptables docker

1 Answers

  1. That's because docker uses nat by default for networking. You should start your docker in bridge mode. See docker bridge

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