you should not need a nodes.dat web link more than once. Even more, I have never used it (AFAIK), since the very first time I run aMule (it has no nodes.dat file) I usually just start aMule, connect to ed2k, start downloading some file, and once some sources have been acquired via ed2k, I can start kad with no problem. Then, it just starts geting more and more kad peers, and then when I close aMule, it saves the nodes.dat file, so it's ready to be used the next time I start aMule.
Regards.