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Bill HerdeFlag for United States of America

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Virtual machines unable to access network

I have a challenge.

The host is a ESXi 5.5 machine which has several VMs running on it.  The host has 4 vswitches, the first being the default VM Network, the second has a single NIC and connects to the DMZ port of the firewall.  The remaining two have only VMkernels for iscsi connections.  All VMs have static IPs  on a 10.0.15.0/24 network.  All point to the same gateway at 10.0.15.2.  All have the same DNS servers. All are connected to the same VM Network.  All these go through a layer 3 switch with a few VLans that have IPs assigned to them to get the public IPs on the ports, but for the most part, most of it is just a simple switch. All VM Network plugs are verified in the correct ports for the "inside" network, and out of the VLANs that have the public IPs. IPV6 is turned off while trying to figure this out.

The fun part is that only half of the VMs are able to access or ping the internet, or ping the gateway, but CAN ping and access other servers in the same subnet as long as those servers are virtual. The machines that are affected cannot ping any other physical device. DNS does work even on these VMs.  

All windows firewalls are off.  
All antivirus is disabled.
VM tools are up to date.

Everything I can find in the settings and VMware make a side to side match between VMs that work and those that don't.  The IP is not blocked anywhere, and this was verified by putting a physical machine on the suspect IP (VM nic disabled) and validating network and internet access.

Ideas?  I'm confused.
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Bill Herde
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Addendum
Problem returned!
Found that one of three NICs in vnetwork on the server had a bad plug.  Removed NIC from VSwitch and it has stayed fixed.