I'm experiencing some problems when trying to connect my PC to the router through a switch. When the PC is directly connected to the router, everything works fine, Ubuntu (14.04) starts normally, and the Internet connection runs inmediately. The Ethernet controller is the Intel Corporation Ethernet Connection, as lspci returns:
$ lspci | grep Eth
00:19.0 Ethernet controller: Intel Corporation Ethernet Connection I217-V (rev 04)
However, when I try to connect through the switch what I get is the following. dmesg returns:
$ dmesg | grep eth
[ 1.035585] e1000e 0000:00:19.0 eth0: registered PHC clock
[ 1.035587] e1000e 0000:00:19.0 eth0: (PCI Express:2.5GT/s:Width x1) 00:22:4d:a7:be:5d
[ 1.035589] e1000e 0000:00:19.0 eth0: Intel(R) PRO/1000 Network Connection
[ 1.035625] e1000e 0000:00:19.0 eth0: MAC: 11, PHY: 12, PBA No: FFFFFF-0FF
[ 1.357838] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 2.165413] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 2.165574] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 2.641287] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 16.715086] e1000e: eth0 NIC Link is Up 100 Mbps Full Duplex, Flow Control: Rx/Tx
[ 16.715090] e1000e 0000:00:19.0 eth0: 10/100 speed: disabling TSO
[ 16.715117] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
It looks like eth0 is properly working. Actually, nm-tool returns:
$ nm-tool
- Device: eth0 [Conexión cableada] -------------------------------------------
Type: Wired
Driver: e1000e
State: connected
Default: yes
HW Address: 00:22:4D:A7:BE:5D
Capabilities:
Carrier Detect: yes
Speed: 100 Mb/s
Wired Properties
Carrier: on
IPv4 Settings:
Address: 192.168.1.30
Prefix: 24 (255.255.255.0)
Gateway: 192.168.1.1
DNS: 80.58.61.250
DNS: 80.58.61.254
DNS: 192.168.1.1
However, ping returns:
$ ping 192.168.1.1
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
From 192.168.1.30 icmp_seq=1 Destination Host Unreachable
From 192.168.1.30 icmp_seq=2 Destination Host Unreachable
From 192.168.1.30 icmp_seq=3 Destination Host Unreachable
The connection is restored by restarting it:
# ifconfig eth0 down
# ifconfig eth0 up
From this point on, everything runs smoothly, as if the PC were directly connected to the router.
It seems to be an issue related to the integrated LAN adaptor and the Ethernet controller, since my laptop connects without any problem. My desktop board is an Intel DB85FL.
I'd be grateful if anyone could give some ideas on how to solve this issue. Thank you in advance.
