After the several trials in my environment,
I noticed some rules over this son of a bitch ASUS P8P67 rev B3 on-board NIC RTL8111E.
Okay, here we go!
RTL8111E using Jumbo Frame in Win7 101.
o If you would like to enable Jumbo Frame using RTL8111E with Realtek latest driver (V7.43.321.2011),
it is always mandatory that 8111E frame size setting shall be greater than peer's you would like to connect.
o If you would not obey the rule as above, (1024 * N ) - 3 byte packet length will be used in 8111E,
and once 8111E receives the packet then 8111E would immediately stop communicating with
peer. (where N is 2, 3, 4, 5, 6, 7, 8, 9 as Jumbo Packet size of KB)
You can choose the Jumbo Frame size as Default(1518), 4102, 7422, 9694 in Buffalo NAS.
RTL8111E latest driver for Win7 allows to set Disable, 2, 3, 4, 5, 6, 7, 8, 9KB in the driver.
I tried to connect with all of the combination for the settings and sort out the rule of thumb. Boring!!!
I just purchased Intel Giga bits CT /PCI-X and it works amasing with 9014 byte Jumbo Frame.
Hey! Realtek guys, the latest driver for RTL8111E is really crap!
This comes from just my hunch, but the Win7 latest driver for RTL8111E does not work correctly
for Jumbo Frame setting. It wasted my time a lot. I hate you.
I am sure that Jumbo Frame is not optional under the Giga Bits environments.