GitHub user bhorvitz created a discussion: Allow default gateway IP assignment 
to VNF device via VR

Hi all,

I'm pretty sure the answer to this question is that it can't be done, but I 
thought I'd ask.  I have a configuration where I create an isolated guest 
network and deploy a VR which handles only DHCP and UserData.  I then deploy a 
VNF appliance which is the default gateway for the subnet.  Works great.

What's I'd love to do though, is when I attach the guest network to the VNF 
appliance is to be able to allocate the default gateway to the VNF but of 
course, the VR says that it's a reserved IP and we can't assign it from DHCP.  
Makes sense for most cases, but it would be nice to have a way to override for 
this particular use.

To get around this, I'm assigning a random out of the way IP to the VNF and 
then statically defining the gateway IP, but at scale this would be a lot 
easier with DHCP.  Maybe if this isn't possible in the current format, it would 
be a nice feature request to override the default behavior for a VNF.

Thanks,
  Brian

GitHub link: https://github.com/apache/cloudstack/discussions/12814

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