How to get true net=host?

[alininja]

Hi, sorry if this isn't really a bug.

Expected behavior

I wanted to have the container use the same IP as the Mac host using the --net=host or network_mode: host options.

Actual behavior

The HyperKit/xhyve/bhyve or something requires the container to take on a separate IP.

Information

Diagnostic ID: FF15D52E-9115-4F19-8A44-C88B257007C2
Docker for Mac: 1.12.0-a (Build 11213)
macOS: Version 10.11.6 (Build 15G31)
[OK] docker-cli
[OK] app
[OK] moby-syslog
[OK] disk
[OK] virtualization
[OK] system
[OK] menubar
[OK] osxfs
[OK] db
[OK] slirp
[OK] moby-console
[OK] logs
[OK] vmnetd
[OK] env
[OK] moby
[OK] driver.amd64-linux

Steps to reproduce

1. ifconfig | grep inet #192.168.xxx.xxx
2. docker run --net=host --rm -i cyberkov/node-sonos-http-api /bin/sh
3. ifconfig | grep inet #192.168.yyy.yyy

The reason I want the container IP to match the host IP is because the container is trying to discover uPNP devices so the devices need to be able to reach back to the container directly.

Maybe there's some other Docker/networking/uPNP trick that I'm missing. But if there is, then please let me know.

I'm also not sure if the docs should make users aware that --net=host for Docker for Mac behaves slightly different. 20/20 hindsight says it should have occurred to me that there is another machine inside the host, but everything works so transparently with Docker for Mac, it just totally didn't occur to me until hours later.

Thanks again for such an awesome product.

[bric3]

Another use case, I'd like to use binaries in docker images, e.g. cqlsh or sqlplus to access connect an ssh tunnel opened on my host to access distant machines right now this doesn't seem to work.

± ❯ ssh -Nf stg-cassandra2
± ❯ telnet localhost 19042
Trying ::1...
Connected to localhost.
Escape character is '^]'.
^]
telnet> quit
Connection closed.
± ❯ docker run -it --net=host --rm alpine telnet localhost 19042
telnet: can't connect to remote host (127.0.0.1): Connection refused

On linux it works.

Just in case the ssh config is ok

Host stg-cassandra2
   HostName 10.x.x.x
   LocalForward 19042 10.x.x.x:9042

Diagnose

Docker for Mac: version: 1.12.2-rc1-beta27 (179c18c)
OS X: version 10.11.6 (build: 15G1004)
logs: /tmp/169BF977-A7DB-43D5-878B-C3A3A6785689/20161011-182006.tar.gz
[OK]     docker-cli
[OK]     virtualization kern.hv_support
[OK]     menubar
[OK]     moby-syslog
[OK]     dns
[OK]     disk
[OK]     system
[OK]     app
[OK]     osxfs
[OK]     virtualization VT-X
[OK]     db
[OK]     slirp
[OK]     logs
[OK]     env
[OK]     vmnetd
[OK]     moby-console
[OK]     moby
[OK]     driver.amd64-linux

[samoht]

I am consolidating the issue of make --net=host into #1031, so please subscribe to updates there to be kept updated on the progress we make on that feature. Thanks!

[docker-robott]

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