RTX1100なのですが。
以下のようにLINK　DOWN とLINK　UP を繰り返しています。
まず、何から調べたらよいでしょうか。
お願いします。
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2009/08/27 22:46:05: LANC1: PORT1 link up (100BASE-TX Full Duplex)
2009/08/27 22:46:05: LANC1: link up
2009/08/27 22:47:32: LANC1: PORT1 link down
2009/08/27 22:47:32: LANC1: link down
2009/08/27 22:47:35: LANC1: PORT1 link up (100BASE-TX Full Duplex)
2009/08/27 22:47:35: LANC1: link up
2009/08/27 22:49:02: LANC1: PORT1 link down
2009/08/27 22:49:02: LANC1: link down
2009/08/27 22:49:08: LANC1: PORT1 link up (100BASE-TX Full Duplex)
2009/08/27 22:49:08: LANC1: link up
2009/08/27 22:50:41: LANC1: PORT1 link down
2009/08/27 22:50:41: LANC1: link down
2009/08/27 22:50:44: LANC1: PORT1 link up (100BASE-TX Full Duplex)
2009/08/27 22:50:44: LANC1: link up
2009/08/27 22:51:41: LANC1: PORT1 link down
2009/08/27 22:51:41: LANC1: link down
2009/08/27 22:51:44: LANC1: PORT1 link up (100BASE-TX Full Duplex)
2009/08/27 22:51:44: LANC1: link up
2009/08/27 22:53:14: LANC1: PORT1 link down
2009/08/27 22:53:14: LANC1: link down
2009/08/27 22:53:20: LANC1: PORT1 link up (100BASE-TX Full Duplex)
2009/08/27 22:53:20: LANC1: link up