example: management network

[liambrady]

management networks can be configured such that a set of nodes are automatically connected to the host (or some other interface outside of munet) by taking advantage of the 'hostintf' and 'initial-setup-host-cmd' config options.

this example demos such a case, connecting munet nodes to an external network namespace.

thanks to @dfedyk for the original topology demoing a similar approach to doing this.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.88%. Comparing base (d611d46) to head (acd089f).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #70      +/-   ##
==========================================
- Coverage   60.07%   57.88%   -2.20%     
==========================================
  Files          19       19              
  Lines        5829     5794      -35     
==========================================
- Hits         3502     3354     -148     
- Misses       2327     2440     +113     

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[choppsv1]

Rather than call this mgmt-net I'd call it init-host-net There are probably lots of examples we could come up in that category, this is one example that does a lot more than just mgmt-net it's doing host-side raw networking changes among other things.

FWIW, I often create topologies where all the nodes share a common network and I usually call this the "management" network (e.g., mgmt), as this configuration is very common in the industry where routers are all accessed on their "managment interface" which is attached to a "management network". This mgmt network will not carry user/customer traffic which will be on all the other interfaces on the various routers.

FWIW, munet has a simple method to give access to default routing to the nodes.

[choppsv1]

Please change the directory this is in to init-host-net rather than mgmt-net

[liambrady]

name of example topology has been changed (and the commit message updated). A rebase will follow this push.