I'm having this problem in two out of three feisty pc's I'm using. Both of them 
have Realtek-based ethernet cards.
from lspci: 
02:02.0 Ethernet controller: Realtek Semiconductor Co., Ltd. 
RTL-8139/8139C/8139C+ (rev 10)
and
02:02.0 Ethernet controller: Realtek Semiconductor Co., Ltd. 
RTL-8139/8139C/8139C+ (rev 10)

The working card I can't access right now, but I'm sure has a Broadcom card, 
and it works properly.
When I try the suggested command, the pc refuses to do it with the following 
output:

[EMAIL PROTECTED]:~$ sudo ethtool -K eth0 sg off rx off tx off tso off
Cannot set device rx csum settings: Operation not supported
[EMAIL PROTECTED]:~$ sudo ethtool -K eth0 sg off tx off tso off
Cannot set device tx csum settings: Operation not supported
[EMAIL PROTECTED]:~$ sudo ethtool -K eth0 sg off  tso off
Cannot set device scatter-gather settings: Operation not supported
[EMAIL PROTECTED]:~$ sudo ethtool -K eth0   tso off
Cannot set device tcp segmentation offload settings: Operation not supported

As you can see, I had to remove parameters one by one (well, two each time, 
really) to get the next message. It seems the 8139too driver won't support that 
operations....
So, the problem is still here for me.

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VMWare Player guest OS and Host Kubuntu cannot SSH into each other
https://bugs.launchpad.net/bugs/105697
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