How to add additional Network cards to a VMware virtual machine

I currently have a VMware host running ESXi 5.5.0 this host has 6 physical network cards connected,
The function of this host is to run one virtual server that is a software base firewall appliance; this appliance needs to support 6 different networks, ESXi can see all 6 network cards but the vm will only support 4 is the a way to get the VM to support more than a Network cards?

Thanks
ahmad1467Asked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You can install up to 10 network interfaces per virtual machine.

What is the OS?

What is the virtual machine hardware version ?

Make sure ALL the network interfaces in the VM are VMXNET3.

You will also need to have created six (6) virtual switches, and six (6) virtual machine portgroups.

See my EE Article

HOW TO: Configure basic networking on a VMware vSphere Hypervisor 5.1 (ESXi 5.1) Host Server

ESXi 5.5 Maximums

http://www.vmware.com/pdf/vsphere5/r55/vsphere-55-configuration-maximums.pdf

Are you using ESXi 5 5?
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