Hey Sinkers....
What plan are you on with Optus ??....Just remember that once your monthly quota is up they will shape you back to 64kbps until your new month begins....
I'm with Bigpond and I've just about used up all of mine for the month..lol..
Do you get the option to check your allowance meter with Optus ??
Another thing I noticed is that you have a Nat Firewall in your modem...
Here are the instructions for you to Port Forward...
Port Forwarding for the Siemens Speedstream-6520