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I just installed Arch with Archboot. On boot, there's about 50% change of eth0 to go up. If it doesn't I'll have to reboot. What could cause this?

If it goes up, dmesg contains:

[ 7.9...] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[11.5...] e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: None
[11.5...] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready

If it doesn't, only the "link is not ready" line is there. The server is configured for a static IP at 192.168.1.16, gateway 192.168.1.1 and DNS 192.168.1.1.

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Try ifconfig eth0 up then dhcpcd eth0 to see what happens after it has failed at boot and add that to your post. service NetworkManager stop before you do that. –  TAFKA 'goldilocks' Jan 28 '13 at 13:34
    
If OP uses a static address, there presumably is no DHCP server around (and if there is, calling on it probably screws up the configuration). Or the "static address" is really a fixed address handed out by DHCP... "Link not there" means that the eth0 isn't seeing a live link. Maybe something in your network is broken, perhaps a cable or a connector not firmly seated, connectors dirty, the card itself, of the switch on the other end. –  vonbrand Jan 28 '13 at 15:22
    
Two of the lines from the log are relevant for IPv6 only. Do you have lines for IPv4 too? I wonder why the nic takes so long until the link is ready. Is there an extra firmare loaded into the nic? –  ott-- Jan 28 '13 at 15:32
3  
Maybe also check cable and the switch/hub. Sometimes this is hardware problem. –  John Siu Jan 28 '13 at 15:37
    
If it's a recent installation, chances are that it's using the new predictable network interfaces introduced on systemd 197. In any case, if this doesn't help fix the issue, a little explanation of how is your network configured can give people clues of what is wrong. –  Martín Canaval Jan 29 '13 at 19:33
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