GitHub user bradh352 added a comment to the discussion: private gateway attach 
to physical network issue

Inspecting the database gave me a hint, the traffic type in the database said 
"Guest" and I didn't have any guest network defined for my 'mgmt' physical 
network.  I'd think it should have errored out if it was needed, so I don't 
honestly know how it chose what to use.

These are the instructions I created for my own future reference:

## Access to Ceph Network

We need to be able to add a private gateway to access the hypervisor network 
which is also our management network.

In order to do that we must add a tag to our management network and then add 
support for guest traffic types and finally set the traffic label to match our 
interface name.

1. Under Infrastructure -> Zones -> Select Zone -> Physical Networks, choose 
the mgmt network.
2. Click the pencil button to update the physical network and add a tag.  I 
just used 'mgmt', not sure the tag matters but it won't let us add multiple 
guest networks in the zone without them having different tags.
3. Click the `[+]` button to add a traffic type and choose `guest`, set the 
isolation method to `vlan`
4. Finally click the merge or branch looking button which is really `update 
traffic labels` then select the Guest network and set the kvm traffic label to 
the network interface name, in our case `hypervisor`



GitHub link: 
https://github.com/apache/cloudstack/discussions/11795#discussioncomment-14609798

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