Problem in emule

That's correct. Your router is blocking some or all of Emule's ports. In order to get an higher ID, set your router to forward traffic ports. Very good explanation to the issue is in Emule's preferences, Where you'll also find which ports you need to forward. You may also check your connection to see whether ports are forwarded correctly. If not Emule will suggest to troubleshoot the problem. Post again if you need more help.

You can find specific port-forwarding tutorials for your modem on PortForward.Com.

It really helped me, personally. 

Although the answer regarding the router and embeded port filtering is the probable cause, just to make sure, see that you dont have some kind of PC firewall that block the traffic on the client as well

And BTW, to check which ports you need to open up, 

Go in the E-mule settings to connection and there you will see them