Second NETWORK card takes over the management network

I have a lab of dev ESXI 5.5 on a Dell PowerEdge 2950 with a dual port GbE NIC (Broadcom NetXtreme II BCM5708).

My basic configuration was a port of configured NIC (vmnic0) with a switch (vSwitch0) Standard.  vSwitch0 was a group of Virtual Machine (for VMS) ports and a VMkernel Port (for the management network).  Everything worked well at this point.

When I try to configure the second NIC (vmnic1) to a different network switch port and different to connect to iSCSI, network range vmnic1 took over the management network even if it does not show as being the management network.  After that, I'm more able to connect or ping the IP of vmnic0.

When you configure the vmnic1, I added connection Type of VMkernel.  I did not choose to use the port for traffic management group.

When I look at the console and choose to configure the management network I see only being vmnic0selected network adapter.

Am I misunderstood the management network configuration?  If not, does anyone have a suggestion on what may be wrong or how I can diagnose?

Thank you for your comments!

-Sean

I think I knew what was going on.

I had my VMkernel for networking (192.168.2.0/24) in a different subnet to the VMkernel for iscsi link port (192.168.1.0/24).  The problem was due to the existence of a network trace unidirectional from 192.168.1.0/24 to 192.168.2.0/24 (but not in the opposite direction). As stated in the post of the blog below and elsewhere, if there are two VMkernels in networks with a direct route, the esxi host will be simply choose one of the VMkernels to act as the management network (no matter if only one of the VMkernels has active network management).

I thought my networks did not have a direct route because of the impossibility (192.168.2.0/24) management network to communicate with the network of liaison port iscsi (192.168.1.0/24) but because the 192.168.1.0/24 network may route to 192.168.2.0/24, he made the two viable VMKernels to act as the point of view of the host management networks.

After that I moved the post iscsi binding to a switch with no network route, my problem has been resolved.

Re-reading the following is a blog post that helped me to understand my problem.

http://blogs.VMware.com/kb/2013/02/challenges-with-multiple-VMkernel-ports-in-the-same-subnet.html

Thanks to those who took the time to review and respond to my problem.

Tags: VMware

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