Prioritizing traffic from "main" computer on LAN

My Current Setup
internet router (dhcp server) main computer
●──────────────────●────────────(eth1)─●
│ │(eth0)
│ │
│ switch │
└─────●─────────────┘
│
└─● [other computers]
My main computer is connected to the router via a switch on eth0 and directly via a usb cable on eth1. Other computers on the LAN connect to the router via the switch.
The Problem
I need to shape traffic in such a way that priority is given to uploads from the main computer when other computers are uploading.* I do not always have the option of throttling the upload on the other systems and I do not want to impose any arbitrary limits on them. I simple want to make sure that all the necessary bandwidth is given to the main computer and whatever is leftover can be used for the other computers.
NOTE: I cannot shape traffic via the router. My ISP uses crippling firmware and I cannot bypass it.
The Plan
The main computer is not always on so I can't configure it to be an integral part of the network. I don't mind having to disconnect and reconnect a cable though so I suspect that I can disconnect the switch from the router and thus shape traffic from the other computers by passing it through the main computer:
internet router (dhcp server) main computer
●──────────────────●────────────(eth1)─●
│(eth0)
│
switch │
●─────────────┘
│
└─● [other computers]
This is where I need some help. I've looked through a lot of documentation but I'm still not sure how to set this up. I think I need to use proxy ARP (with iproute2) but I'm hoping that someone else can confirm this before I explore it further. I'm afraid that I'll waste time only to find that it was a false start and that I need to do it differently.
Can anyone with network configuration experience confirm that proxy ARP is the way to go? If not, what do you suggest?
I would also appreciate any links to relevant tutorials|guides|documentation. I wouldn't mind some simple examples either but I'm not asking anyone to do this for me. I just need to know that I'm on the right path.
Thanks.
*I'm only concerned about upload bandwidth right now because I'm on ADSL and download bandwidth is usually not an issue. I also expect that any solution for upload shaping will work for download shaping as well.

Xyne wrote:I think I need to use proxy ARP (with iproute2) but I'm hoping that someone else can confirm this before I explore it further. I'm afraid that I'll waste time only to find that it was a false start and that I need to do it differently.
God no.... Proxy ARP is the most god awful creation ever created. The person who thought that was a good idea should be taken out the back and shot.
You want to create a bridge with eth0 and eth1 = br0 so they both act on the same Layer 2 (ie, your Main computer becomes a 2-port switch). This should get you going, you'll just have to hack out / modify the firewall parts to do the traffic prioritisation stuff:
http://www.sjdjweis.com/linux/bridging/

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