With this commit:

Revision: 1f6729ffe98095107ce82e67a4a0209674601a90
Author: jiaxinwu <jiaxin...@intel.com>
Date: 7/7/2015 2:19:55 AM
Message:
MdeModulePkg: Update Ip4Dxe driver to support Ip4Config2 protocol,

a new behavior seemed to come in to the network stack that was not present 
before: It appears now that as soon as the DHCP Service Binding protocol is 
installed the DHCP process will be initiated (see 
Ip4Config2OnDhcp4SbInstalled).  This differs from past behavior where DHCP 
would only occur if a driver or application specifically did Configure() on the 
network interface.

For some systems this is problematic because they need to defer DHCP until it 
is certain that the network interface will be used for something.

Can you provide the reason for this change?  Can we have a policy (PCD) to 
disable this mode of operation?

Thanks,

Eugene


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