Two iPXE Servers in one Network

[NiKiZe]

There is no such thing as "iPXE server"
PXE consists of a few different technologies:
* DHCP server to provide IP and TFTP server address and filename
* TFTP server that is used to download the file provided by DHCP
* A file downloaded from TFTP
There is no "one solution works for everything" to redirect between different configurations here.

However Fog uses iPXE mostly, so as long as you can have a menu item that chains the FOG provided menu it should be doable.
From what I have seen FOG uses a modified version of iPXE so you might need to chain that first, and then do some special handling for it to use the wanted configuration/scripts