Ik heb iets gevonden! De tijdstippen corresponderen met "hangen". Misschien is het de netwerk switch. Ik heb een 24poorts gigabit switch staan. Vervangen is duur, dus eerst maar even testen met kleine switch ertussen. Als de link down blijft gaan, dan ligt het aan de netwerkkaart van de VU, als de verbinding blijft, maar toch af en toe hangt, ligt het aan de switch. Ik houd jullie op de hoogte!
root@vusolo2:~# grep bcmg /var/log/messages
Dec 23 20:10:30 vusolo2 user.info kernel: bcmgenet: configuring instance #0 for external RGMII
Dec 23 20:10:30 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link up, 1000 Mbps, full duplex
Dec 23 20:13:58 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link down
Dec 23 20:14:02 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link up, 1000 Mbps, full duplex
Dec 23 20:14:11 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link down
Dec 23 20:14:18 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link up, 1000 Mbps, full duplex
Dec 23 20:15:30 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link down
Dec 23 20:15:33 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link up, 1000 Mbps, full duplex
Dec 23 20:16:50 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link down
Dec 23 20:16:54 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link up, 1000 Mbps, full duplex
Dec 23 20:16:59 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link down
Dec 23 20:17:03 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link up, 1000 Mbps, full duplex
Dec 23 20:17:10 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link down
Dec 23 20:17:14 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link up, 1000 Mbps, full duplex
Dec 23 20:17:16 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link down
Dec 23 20:17:19 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link up, 1000 Mbps, full duplex
Dec 23 20:17:20 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link down
Dec 23 20:17:27 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link up, 1000 Mbps, full duplex
Dec 23 20:17:36 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link down
Dec 23 20:17:40 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link up, 1000 Mbps, full duplex
Dec 23 20:17:44 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link down
Dec 23 20:17:48 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link up, 1000 Mbps, full duplex
Dec 23 20:18:06 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link down
Dec 23 20:18:10 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link up, 1000 Mbps, full duplex
Dec 23 20:18:11 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link down
Dec 23 20:18:14 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link up, 1000 Mbps, full duplex
Dec 23 20:18:15 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link down
Dec 23 20:18:18 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link up, 1000 Mbps, full duplex
Dec 23 21:09:04 vusolo2 user.warn kernel: [<803e86dc>] bcmgenet_poll+0x2e4/0x45c
Dec 23 21:30:28 vusolo2 user.warn kernel: [<803e86dc>] bcmgenet_poll+0x2e4/0x45c
Dec 23 21:32:32 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link down
Dec 23 21:32:35 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link up, 1000 Mbps, full duplex
Dec 23 21:32:43 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link down
Dec 23 21:32:46 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link up, 1000 Mbps, full duplex
Dec 23 21:32:49 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link down
Dec 23 21:32:52 vusolo2 user.info kernel: bcmgenet bcmgenet.0 eth0: link up, 1000 Mbps, full duplex