Port Forwarding to Mac Pro with 2 different internet connections

I have my Mac Pro connected to the back of my cable modem. I have given this service the name "Cable" in my network preferences. The details are:
IP: xxx.xxx.xxx.100
Subnet: 255.255.248.0
Router: xxx.xxx.xxx.1
I have the other Ethernet port of my Mac Pro connected to the back of my Airport Extreme which runs ADSL+ from another ISP. I have called this service "ADSL". The details for this connection are:
IP: xxx.xxx.xxx.188
Subnet: 255.255.255.0
I run a calibre server on the Mac Pro and on my PC (the PC is directly plugged into the back of the Airport Extreme). I have a Dyndns service that works on the address of the Airport Extreme base station.
I can access the PC's calibre server via the mobile network but NOT the Mac's. Even though I have port forwarding to the Mac's reserved IP address of 188, I can't access the server. I can access it on my iphone/ipad via WIFI but not from the mobile network.
If in my Network preferences I change the order of the services i.e. make the ADSL the top service and cable the second, I CAN access the server from the mobile network. It works as it should. If I change the order so that the Cable service is on top, I can't access the server again.
Why does this happen? Can I fix this? Do I need to set up another Dyndns service on my Mac Pro?
Any help would be greatly appreciated. I am going to post this as a new post as well because I'm not sure whether the people that were so helpful last time will know that I have updated the post.

Just installed TeamViewer and we're using that. Works great.

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package {
import flash.display.Sprite;
import flash.events.NetStatusEvent;
import flash.net.GroupSpecifier;
import flash.net.NetConnection;
import flash.net.NetGroup;
import flash.text.TextField;
public class NetGroupSample extends Sprite {
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_outputTextField = new TextField();
_outputTextField.width = this.stage.stageWidth;
_outputTextField.height = this.stage.stageHeight;
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gspec.postingEnabled = true;
gspec.serverChannelEnabled = true;
gspec.objectReplicationEnabled = true;
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break;
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   this.traceToOutput("onNetGroupNetStatus:", event.info.code);
   private function traceToOutput(...strings):void {
_outputTextField.appendText(strings.join(" ") + "\n");
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Port Forwarding to Mac Pro with 2 different internet connections

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