I don’t know what’s normal for Gnucleus, but here is a list of Host Catches like “router.limewire.com” that you can add:

gnutella.hostscache.com
connect1.gnutellanet.com
connect2.gnutellanet.com
connect3.gnutellanet.com
connect4.gnutellanet.com
connect5.gnutellanet.com
gnotella.fileflash.com
public.bearshare.net
connect1.bearshare.net
connect2.bearshare.net
connect3.bearshare.net

It would be a good idea to ping these and select the best ones, the last time I pinged router.limewire.com it returned “Unknown host”.

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With Desperation comes Inspiration.