hum, I not use ubuntu , but finally I found someone with exactly same hardware and same problem .
on linux-2.6.27 ,
dmesg | grep 04.0
Read Mac address from eeprom
Realtek PHY RTL8201 transceiver as address 1.
...
seams pretty, I get IP from dhcp but after that , can't even ping the gateway
hum, I not use ubuntu , but finally I found someone with exactly same hardware and same problem .
on linux-2.6.27 ,
dmesg | grep 04.0
Read Mac address from eeprom
Realtek PHY RTL8201 transceiver as address 1.
...
seams pretty, I get IP from dhcp but after that , can't even ping the gateway