Port Forwarding on a Router

I'm getting quite frustrated with ARD 2.2. I'm trying to use ARD over the internet to teach my parents how to use their iMacs. I have all of the Network and Sharing settings turned on at their end, which isn't easy to accomplish since they are novice users 1500 miles away. I can use ARD to access and control the macs on my local network, but every time I input my parent's IP addresses, I get the message "Verify Failed", and it can't be because I have the wrong User Name or Password.
I've read a lot about port forwarding for macs behind a router and I may need to do it. But it seems like everyone but me knows how to forward a port and nobody has given step-by-step instructions on how to do this. So I have some questions.
1. I have a Linksys router on my end and a MacSense router on theirs. Do I need to enable Port Forwarding on both routers?
2. When I enter their IP addresses, their computers are "seen" by ARD. How can it "see" these computers if the port forwarding is not enabled?
3. My Linksys router has a web page that controls it, but nowhere is there a "Port Forwarding" option. Where is this located? Is it called by another name? Does it have something to do with NAT? How exactly do you "adjust" NAT settings to open a port?
All the macs in question are using OS 10.4.5 or 10.4.6. My version of ARD is 2.2. Here is the line of connection between their macs and mine:
Parent's iMac : MacSense Router : Cable Modem : INTERNET : Cable Modem : Linksys Router : 4 Port Hub : Airport Extreme Base Station : Powerbook G4.
I would appreciate any suggestions at this point. Thanks!

Things have taken a turn for the worse. After my last solution, we found that my Mom's iMac could not send email. She could receive mail and surf the internet, but not send. The problem showed up as soon as I mucked about with the router ports. She has a .Mac account, btw.
To complicate things, my ARD connection shows my Dad's iMac, not Mom's. I could connect to Dad's iMac through ARD but not Mom's. Only if we shut down Dad's iMac could I connect to Mom's. The odd thing was the connection I was getting to Mom's iMac was listed as Dad's computer!
I have read that ARD can only connect to one computer behind a router. No biggie, I'll just have them turn one off when I use the other. But how to solve the send email problem?
I decided to use the DMZ (De-Militarized-Zone) setting of their router to open all ports on one IP address. When I did this we could finally see my Mom's iMac with her proper name in ARD. But joy was short lived because my control and observe attempts failed. I get the message "Connection Failed to XXX" where XXX is the name of Mom's iMac. Adding insult to injury, the mail still won't send.
ARD shows the Current Application, Current User and Status (Available). I can send messages through ARD and they are received successfully (they can see the messages on their end).
If I can get this far, why can't I observe? And what happened to the sending of email? Help me Obi Won Kanobi - you're my only hope!
1Ghz Aluminum PowerBook G4   Mac OS X (10.4.6)  

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    I'm trying to set up Azureus or transmission but I cannot open the ports successfully.
    The setup is: ADSL router -> gigabit wired switch -> macbook pro
    Upnp is enabled on the router. I spent a long time on IRC trying to solve the problem with some azureus support guys, but we couldn't figure it out. I have set up a manual port forward in the router to my mb. I set the correct port in azureus (/transmission), set an exception in the firewall, but a port test still doesn't work. If I disabled the firewall on the router or my mac, it doesn't work. It doesn't work as an administrator or restricted user. It isn't any settings in Azureus or transmission as I haven't changed the defaults. If I enable upnp in azureus, it works but is slower than it should be, and it should work without it. I'm pretty sure it isn't anything to do with the router as a windows PC set up in exactly the same way with a different IP and port works. I believe this is something on the mac that is blocking the connections, but as I've only had this mac 2 days and I've not installed much, I don't see what it can be.
    EDIT: I could be mistaken, but web downloads seem very slow too. I should get around 400kb/s, I actually get about 20-50 on most downloads it seems.
    I've pretty exhaustively tested this now and its getting quite frustrating. I can post Azureus's upnp logs if anyone wants to see them.
    MBP 15" 2.4ghz Mac OS X (10.4.10)

    Thanks for the help.
    I use openDNS, so it shouldn't be slow.
    I've tried transmission as well as Azureus. I've also used limewire which says the connection is 'turbo-charged' even when I disable upnp, so that's no help really.
    Done the last two steps.
    Here's the upnp log for anyone who can understand it. I have no idea what 169.254.155.79 is (near the bottom)
    [15:54:07] group = /239.255.255.250:0/fw0:fw0-/169.254.155.79: started
    [15:54:07] group = /239.255.255.250:0/en0:en0-/192.168.1.6: started
    [15:54:07] ignoring loopback address /127.0.0.1, interface lo0
    [15:54:07] ignoring IPv6 address /fe80:0:0:0:0:0:0:1%1, interface lo0
    [15:54:07] ignoring loopback address /0:0:0:0:0:0:0:1%0, interface lo0
    [15:54:07] Mapping request: Incoming Peer Data Port (UDP/56456), enabled = true
    [15:54:07] Mapping request: UDP Tracker Client Port (UDP/56456), enabled = true
    [15:54:07] Mapping request: Incoming Peer Data Port (TCP/56456), enabled = true
    [15:54:07] Mapping request: Incoming Peer Data Port (TCP/8080), enabled = false
    [15:54:07] Mapping request: TCP Tracker Port (TCP/6969), enabled = false
    [15:54:07] Mapping request: TCP SSL Tracker Port (TCP/7000), enabled = false
    [15:54:07] Mapping request: UDP Tracker Port (UDP/6969), enabled = false
    [15:54:07] Mapping request: Distributed DB (UDP/56456), enabled = true
    [15:54:07] Device 'http://192.168.1.1:80/DeviceDescription.xml' is ok: discover=0,found=0,readok=0,read_bad=0,map_ok=0,mapbad=0
    [15:54:07] UPnP: root discovered: usn=uuid:11111111-%04x-c0a8-101001349b0e9::upnp:rootdevice, location=http://192.168.1.1:80/DeviceDescription.xml, ni=en0,local=/192.168.1.6
    [15:54:07] Downloading: http://192.168.1.1:80/DeviceDescription.xml
    [15:54:08] Relative URL base is http://192.168.1.1:80
    [15:54:08] ZyXEL Prestige 660HW-T1 Internet Sharing Gateway
    [15:54:08] urn:schemas-upnp-org:service:Layer3Forwarding:1:desc=http://192.168.1.1:80/L3Fw d.xml, control=http://192.168.1.1:80/UD/?0
    [15:54:08] ZyXEL Prestige 660HW-T1 Internet Sharing Gateway
    [15:54:08] urn:schemas-upnp-org:service:WANCommonInterfaceConfig:1:desc=http://192.168.1.1 :80/WanCommonIfc1.xml, control=http://192.168.1.1:80/UD/?1
    [15:54:08] ZyXEL Prestige 660HW-T1 Internet Sharing Gateway *
    [15:54:08] urn:schemas-upnp-org:service:WANDSLLinkConfig:1:desc=http://192.168.1.1:80/WanD slLink.xml, control=http://192.168.1.1:80/UD/?2
    [15:54:08] urn:schemas-upnp-org:service:WANIPConnection:1:desc=http://192.168.1.1:80/WanIp Conn.xml, control=http://192.168.1.1:80/UD/?3
    [15:54:08] ZyXEL Prestige 660HW-T1 Internet Sharing Gateway
    [15:54:08] urn:schemas-upnp-org:service:LANHostConfigManagement:1:desc=http://192.168.1.1: 80/LanHostCfgMgmt.xml, control=http://192.168.1.1:80/UD/?4
    [15:54:08] Found WANIPConnection
    [15:54:08] Downloading: http://192.168.1.1:80/WanIpConn.xml
    [15:54:08] UPnP: Mapping 'Incoming Peer Data Port (UDP/56456)' established
    [15:54:08] UPnP: Mapping 'Incoming Peer Data Port (UDP/56456)' established
    [15:54:08] Mapping UDP Tracker Client Port (UDP/56456) already established
    [15:54:08] UPnP: Mapping 'Incoming Peer Data Port (TCP/56456)' established
    [15:54:08] UPnP: Mapping 'Incoming Peer Data Port (TCP/56456)' established
    [15:54:08] Mapping Distributed DB (UDP/56456) already established
    [15:54:22] Device 'http://169.254.155.79:8008/RootDevice.xml' is ok: discover=0,found=0,readok=0,read_bad=0,map_ok=0,mapbad=0
    [15:54:22] UPnP: root discovered: usn=uuid:89bccb25-4b13-af9e-e5ab-94be0185a62b::upnp:rootdevice, location=http://169.254.155.79:8008/RootDevice.xml, ni=fw0,local=/169.254.155.79
    [15:54:22] Downloading: http://169.254.155.79:8008/RootDevice.xml

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