intermittant internet on off like a 2 stroke motor

[wolfproud]

it's hard not to take it personally it only seems to go on off most when i want new Internet pages to go to
another thread said to see if "cat /var/log/kern.log.0 | grep eth0"could see a problem
i saw this
Mar 24 03:01:30 wolfproud-desktop kernel: [19088.878194] eth0: link up.
Mar 24 03:01:42 wolfproud-desktop kernel: [19101.295091] eth0: link down.
Mar 24 03:01:44 wolfproud-desktop kernel: [19103.201477] eth0: link up.
Mar 24 03:06:18 wolfproud-desktop kernel: [19377.410405] eth0: link down.
Mar 24 03:06:20 wolfproud-desktop kernel: [19378.957604] eth0: link up.
Mar 24 08:00:11 wolfproud-desktop kernel: [37009.907782] eth0: link down.
Mar 24 08:00:12 wolfproud-desktop kernel: [37011.563018] eth0: link up.
Mar 24 08:00:26 wolfproud-desktop kernel: [37026.553659] eth0: link down.
Mar 24 08:00:30 wolfproud-desktop kernel: [37030.951744] eth0: link up.
Mar 24 08:00:34 wolfproud-desktop kernel: [37035.215584] eth0: link down.
Mar 24 08:00:36 wolfproud-desktop kernel: [37036.763260] eth0: link up.
Mar 24 08:00:37 wolfproud-desktop kernel: [37038.302587] eth0: link down.
Mar 24 08:00:39 wolfproud-desktop kernel: [37039.944517] eth0: link up.
and lots more of the same
its the same hub or direct

[wolfproud]

forgot to say im ubuntu 9.04 running with clear communication Internet