dunno if could be useful for debugging, but can you post results of

dmesg | grep eth0 ?

for what it worth i have a simile isp configuration > a dsl router that act as a dhcp server where i can plug up to three boxes, and i have no problem with 2.3...

ciao



        
---------------------------------
Yahoo! Mail: gratis 1GB per i messaggi, antispam, antivirus, POP3