This question could apply to any Airport Extreme and is not about the meaning of DHCP or NAT etc, but the wording used by Apple in the configuration and what that might mean - specifically, what do they mean by "DHCP only"?
Bridged of course means no routing whatsoever and the 4 ethernet ports simply act as a 4 port switch. "DHCP and NAT" means full routing between the 3 LAN ports (and wireless) and the WAN port, using NAT and acting also as a DHCP server. But inbetween there is "DHCP only" and I'm trying to understand what that means - precisely.
I guess the important issue is whether there is any router functionality in this mode. There is when in "NAT and DHCP", but not when it's set to "Bridged only". However, I can find no information about whther there is or not when it's set to "DHCP only".
The reason I ask is that I want to use an Airport Extreme (gigabit) on a network to bridge the wired and wireless ethernet segments. "Bridged only" would work except I want it to also provide DHCP. But if "DHCP only" is selected, does it try to route between the WAN port and the LAN ports, or do I have 4 equivalent ports as per "Bridged only" mode?
The issue I have is that the network I am setting up has NO Internet access. Unbelievable as that may seem to some of you, networking is not all about Internet access and it should be possible to operate a DHCP server on a LAN with no functional router. Apple products like to insist on there being one, but they're wrong to insist that. So can I use an Aiport to do what I need? Anyone know whther routing functionality is disabled in "DHCP only" mode?