From AMule Project FAQ
Having a Low ID is a common problem in the ed2k network. In this wiki you can find several articles which might help you to get a High ID.
Since having a Low ID is almost always due to having the FAQ_eD2k-Kademlia ports publicly unavailable, aMule has set up a web page so you can test your ports to see if that is your problem.
Please visit http://www.amule.org/testport.php and test!