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# harvestera
adamant-kite-43734
03/21/2023, 3:59 PMThis message was deleted.
r
refined-analyst-8898
03/21/2023, 4:06 PMThe two types of VM networks I can create in Harvester UI have different options. Apparently, the UntaggedNetwork (PVID=1) simply inherits the configuration of the associated cluster network. The other type is L2VlanNetwork, and for that type I can optionally specify a particular DHCP server (or default to broadcast) or a subnet CIDR and gateway.
l
little-dress-13576
03/21/2023, 4:10 PMIn my case, we will have to write up some custom integration either with DHCP or IPAM. If with IPAM, does it use whereabouts CNI IPAM? Does it auto detect IP conflicts with existing IPs inside the same VLAN? I assume there’s no way to pre-reserve an existing IP inside the VLAN via IPAM?
r
refined-analyst-8898
03/21/2023, 4:12 PMTo me as a user, Harvester doesn't seem to manage the addresses in that way. It's not providing DHCP.
refined-analyst-8898
03/21/2023, 4:13 PMI'm looking at this diagram to understand how it works.
https://docs.harvesterhci.io/v1.1/networking/deep-dive
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little-dress-13576
03/21/2023, 4:13 PMI know it has to use an outside DHCP server. But for IPAM, it seems to have its internal IPAM.. probably something from kubevirt project.
little-dress-13576
03/21/2023, 4:14 PMyeah in the #example-2 in the diagram, it has:
Copy code
# Example 2
{
"cniVersion": "0.3.1",
"name": "untagged-network",
"type": "bridge",
"bridge": "oob-br",
"promiscMode": true,
"ipam": {}
}little-dress-13576
03/21/2023, 4:14 PMnote that the ipam is empty. how to populate that? or by default that’s already working on its own??
little-dress-13576
03/21/2023, 4:15 PMThere’s no doc on this, which is why I also opened a question issue on harvester github..
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bumpy-portugal-40754
03/27/2023, 11:19 PMI don't know anything about IPAM, but we run a DCHP server on the VM VLAN...
r
refined-analyst-8898
03/27/2023, 11:21 PMIs it essential for the metal switch to be vlan aware, i.e. trunk mode, for VM networks to have isolated layer 2?
b
bumpy-portugal-40754
03/27/2023, 11:23 PMNot sure. In the Harvester training they say that one can use the management network also tho create VMs on it... even if it is not advised to do so. Therefore I'd guess it's not essential.
r
refined-analyst-8898
03/28/2023, 12:55 AMIt's true you can create VMs directly in Harvester on the mgmt network, but that's not the case when creating cluster nodes through Rancher with Harvester Cloud Provider. Only the VM networks defined in Harvester can be assigned to those nodes, so the "untagged" pre-defined network, or a created VM network with VLAN=1 will work with an unmanaged metal switch.
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