how to set up network in xubuntu ?

Hello, All
I installed CAELINUX2013 just now. However I could not get connected to internet when in the xubuntu system.
I have no problem with internet connection when in the windows system. I installed both CAELINUX2013 and WINDOWS in the same machine. I connect my computer to the internet using a TPLINK router. In CAELINUX2013, I tried wired connection. No matter what I did, I could not even ping the router. Please could you give me some ideas if you can help.
Thanks in advance.
CFDer

Dear claws
Many thanks for your reply.
Please see below the output of the command dmesg | grep eth0
[ 2.247032] r8169 0000:03:00.0: eth0: RTL8168evl/8111evl at 0xffffc90000c1a000, 74:d4:35:04:9a:d4, XID 0c900800 IRQ 73
[ 2.247036] r8169 0000:03:00.0: eth0: jumbo features [frames: 9200 bytes, tx checksumming: ko]
[ 12.631284] ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 14.049236] r8169 0000:03:00.0: eth0: link down
[ 14.049285] r8169 0000:03:00.0: eth0: link down
[ 14.049855] ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 14.050125] ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 15.616911] r8169 0000:03:00.0: eth0: link up
[ 15.617695] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 26.416007] eth0: no IPv6 routers present
[ 39.824111] NETDEV WATCHDOG: eth0 (r8169): transmit queue 0 timed out
[ 39.840615] r8169 0000:03:00.0: eth0: link up

Please can anyone help me with this?
Thanks in advance.