系统版本：
Distributor ID: Ubuntu
Description: Ubuntu 12.10
Release: 12.10
Codename: quantal
用dmesg查看信息，网卡显示如下：
[ 4440.852134] e1000e: eth0 NIC Link is Down
[ 4442.348867] e1000e: eth0 NIC Link is Up 100 Mbps Full Duplex, Flow Control: None
[ 4442.348875] e1000e 0000:00:19.0: >eth0: 10/100 speed: disabling TSO
请问如何解决这个问题？