New idea on how to get another "apparent" interface so that I can achieve my desired forwarding. I have been reading about VLANs. I am really extrapolating here so please bear with me if I am way off base.
If I created VLANs on my LAN, would I be able to forward LAN:80 to VLAN:8080, having VLAN:80 open to go to the internet? If so, I have some other questions too.
When a machine does a DHCP request, it knows nothing of VLANs, so I assume that the request is picked up by the DHCP server and that the DHCP server assigns it an IP and associates it with a VLAN. How does it choose? The only differentiator would be the MAC address, so this would have to be manually configured, analogous to a static IP. Am I on the right track? I suppose there could be more boxes appearing under the DHCP Server configuration that appear after I make the VLANs, but I don't want to mess up my working configuration until I know that I am barking up a valid tree.
There seems to be an assumption of a managed switch to route VLANS. From what I have read, I don't see anything preventing a cheap layer 2 switch from routing based on MAC address, as long as I cut down the MTU by 4 bytes to make room for the VLAN stuff. 1500 bytes is hardly a power of two anyway, so I would expect the impact on throughput due to fragmenting and assembling 1496 vs. 1500 byte packets would be minimal. Is this good reasoning?
Do I have to have all other traffic on the physical LAN interface be on VLANs too, or can the "base" lan be "normal", with VLANs running on top?
Thanks.