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Seonix
Contributor
Contributor

vCloud Networking Issue

Hi all,

We've recently encountered an odd problem with our vCloud/vSphere networking environment that I'm hoping someone could shed some light on.

Our environment:

- Two host clusters with 4 hosts in each.

- Both clusters have vApps deployed through vCloud and have been working fine for months.

- All vApp networking is through a vApp network with NAT routing configured to an external IP for each VM. Firewall is currently disabled (for testing).

- Each vApp network has a vShield Edge appliance.

The issue:

In one of the two environments, none of the VM's within any vApp can ping each other, nor can they ping the gateway for the vApp network.

Any workstation coming in from the physical network to the virtual environment can ping the entire virtual envrionment up to and including the vShield Edge appliance for the vApp network, but can't ping any VM's internal to the vApp.

Short story is, it would appear that for whatever reason, networking between the vse appliance and vApp VM's isn't functioning correctly. I've tried resetting the vApp networks but haven't got a clue as to where to continue.

Any help would be greatly appreciated and let me know if more info is required.

Simon

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22 Replies
JasonBurrell
Enthusiast
Enthusiast

Sounds like you did not create the vlans on the physical switch and present them to all the esx hosts.

-Jason

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mobinqasim786
Enthusiast
Enthusiast

Hi Jason,

Thanks for the reply. I've already created the VLANs on the physical switch and they are also present in all the hosts. I'm still not able to ping other VM if it is in different host than the vApp network.

Any work around?

EDITED:  I've fixed this by adding the "VLAN Backed" vlan range to LAG group. Now I can ping any VM which reside anywhere in the Cluster.

Thanks

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bumj1
Contributor
Contributor

I realize this is not the solution found in this thread, but I came across this discussion due to similar issues and solved the problem by performing an unprepare and reprepare of the vcloud hosts.  My problem was because I deleted all networks in the vCloud instance.  The cause and resolution is noted in VMware KB: Virtual machines lose network connectivity in a vCDNI network pool .

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