I`m running Ubuntu 12.04 updated till today (09 may 2014 ) and aswell Debian Testing with KDE updated and I have the same trouble the network is not working after a 30 o 45 minutes; I can not restart the network so if I wanna have the network running well I must restart the machine and the modem. Syslog: May 9 16:44:10 pcdebian kernel: [ 2071.820186] via-rhine 0000:00:12.0 eth0: Transmit timed out, status 1003, PHY status 786d, resetting... May 9 16:44:20 pcdebian kernel: [ 2081.820185] via-rhine 0000:00:12.0 eth0: Transmit timed out, status 1003, PHY status 786d, resetting... May 9 17:00:16 pcdebian kernel: [ 3037.820197] via-rhine 0000:00:12.0 eth0: Transmit timed out, status 1003, PHY status 786d, resetting... Kern.log: May 6 12:35:48 pcdebian kernel: [ 1383.808509] via-rhine 0000:00:12.0 eth0: Transmit timed out, status 1003, PHY status 786d, resetting... May 6 13:26:54 pcdebian kernel: [ 0.822714] via_rhine: v1.10-LK1.5.1 2010-10-09 Written by Donald Becker May 6 13:26:54 pcdebian kernel: [ 0.823126] via-rhine 0000:00:12.0 eth0: VIA Rhine II at 0x1f200, 00:19:db:a0:d6:13, IRQ 23 May 6 13:26:54 pcdebian kernel: [ 0.823905] via-rhine 0000:00:12.0 eth0: MII PHY found at address 1, status 0x786d advertising 01e1 Link 45e1 May 6 13:37:07 pcdebian kernel: [ 625.820368] via-rhine 0000:00:12.0 eth0: Transmit timed out, status 1003, PHY status 786d, resetting... May 6 13:37:17 pcdebian kernel: [ 635.820197] via-rhine 0000:00:12.0 eth0: Transmit timed out, status 1003, PHY status 786d, resetting... Ubuntu kern.log May 5 19:28:54 caralu74 kernel: [ 451.136479] device eth0 left promiscuous mode May 5 19:29:01 caralu74 kernel: [ 458.572040] device eth0 entered promiscuous mode May 5 19:36:50 caralu74 kernel: [ 926.820645] via-rhine 0000:00:12.0: eth0: Transmit timed out, status 1003, PHY status 786d, resetting... May 5 19:36:50 caralu74 kernel: [ 926.821393] via-rhine 0000:00:12.0: eth0: link up, 100Mbps, full-duplex, lpa 0x45E1 May 5 19:36:54 caralu74 kernel: [ 930.820180] via-rhine 0000:00:12.0: eth0: Transmit timed out, status 1003, PHY status 786d, resetting... May 9 16:00:02 caralu74 kernel: [ 5408.820181] via-rhine 0000:00:12.0: eth0: Transmit timed out, status 1003, PHY status 786d, resetting... ########################## And this could be useful: May 6 16:13:53 caralu74 dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 7 May 6 16:13:58 caralu74 NetworkManager[1568]: (eth0): DHCPv4 request timed out. May 6 16:13:58 caralu74 NetworkManager[1568]: (eth0): canceled DHCP transaction, DHCP client pid 2876 May 6 16:13:58 caralu74 NetworkManager[1568]: Activation (eth0) Stage 4 of 5 (IPv4 Configure Timeout) scheduled... May 6 16:13:58 caralu74 NetworkManager[1568]: Activation (eth0) Stage 4 of 5 (IPv4 Configure Timeout) started... May 6 16:13:58 caralu74 NetworkManager[1568]: (eth0): device state change: ip-config -> failed (reason 'ip-config-unavailable') [70 120 5] May 6 16:13:58 caralu74 NetworkManager[1568]: Activation (eth0) failed. May 6 16:13:58 caralu74 NetworkManager[1568]: Activation (eth0) Stage 4 of 5 (IPv4 Configure Timeout) complete. May 6 16:13:58 caralu74 NetworkManager[1568]: (eth0): device state change: failed -> disconnected (reason 'none') [120 30 0] May 6 16:13:58 caralu74 NetworkManager[1568]: (eth0): deactivating device (reason 'none') [0] May 6 16:13:58 caralu74 avahi-daemon[1468]: Withdrawing address record for fe80::219:dbff:fea0:d613 on eth0. May 6 16:13:58 caralu74 avahi-daemon[1468]: Leaving mDNS multicast group on interface eth0.IPv6 with address fe80::219:dbff:fea0:d613. May 6 16:13:58 caralu74 avahi-daemon[1468]: Interface eth0.IPv6 no longer relevant for mDNS. May 6 16:14:00 caralu74 avahi-daemon[1468]: Joining mDNS multicast group on interface eth0.IPv6 with address fe80::219:dbff:fea0:d613. May 6 16:14:00 caralu74 avahi-daemon[1468]: New relevant interface eth0.IPv6 for mDNS. May 6 16:14:00 caralu74 avahi-daemon[1468]: Registering new address record for fe80::219:dbff:fea0:d613 on eth0.*. May 6 16:14:01 caralu74 NetworkManager[1568]: Auto-activating connection 'Conexión cableada 1'. May 6 16:14:01 caralu74 NetworkManager[1568]: Activation (eth0) starting connection 'Conexión cableada 1' May 6 16:14:01 caralu74 NetworkManager[1568]: (eth0): device state change: disconnected -> prepare (reason 'none') [30 40 0] May 6 16:14:01 caralu74 NetworkManager[1568]: Activation (eth0) Stage 1 of 5 (Device Prepare) scheduled... May 6 16:14:01 caralu74 NetworkManager[1568]: Activation (eth0) Stage 1 of 5 (Device Prepare) started... May 6 16:14:01 caralu74 NetworkManager[1568]: Activation (eth0) Stage 2 of 5 (Device Configure) scheduled... May 6 16:14:01 caralu74 NetworkManager[1568]: Activation (eth0) Stage 1 of 5 (Device Prepare) complete. May 6 16:14:01 caralu74 NetworkManager[1568]: Activation (eth0) Stage 2 of 5 (Device Configure) starting... May 6 16:14:01 caralu74 NetworkManager[1568]: (eth0): device state change: prepare -> config (reason 'none') [40 50 0] May 6 16:14:01 caralu74 NetworkManager[1568]: Activation (eth0) Stage 2 of 5 (Device Configure) successful. May 6 16:14:01 caralu74 NetworkManager[1568]: Activation (eth0) Stage 3 of 5 (IP Configure Start) scheduled. May 6 16:14:01 caralu74 NetworkManager[1568]: Activation (eth0) Stage 2 of 5 (Device Configure) complete. May 6 16:14:01 caralu74 NetworkManager[1568]: Activation (eth0) Stage 3 of 5 (IP Configure Start) started... May 6 16:14:01 caralu74 NetworkManager[1568]: (eth0): device state change: config -> ip-config (reason 'none') [50 70 0] May 6 16:14:01 caralu74 NetworkManager[1568]: Activation (eth0) Beginning DHCPv4 transaction (timeout in 45 seconds) May 6 16:14:01 caralu74 NetworkManager[1568]: dhclient started with pid 3078 May 6 16:14:01 caralu74 NetworkManager[1568]: Activation (eth0) Beginning IP6 addrconf. May 6 16:14:01 caralu74 avahi-daemon[1468]: Withdrawing address record for fe80::219:dbff:fea0:d613 on eth0. May 6 16:14:01 caralu74 avahi-daemon[1468]: Leaving mDNS multicast group on interface eth0.IPv6 with address fe80::219:dbff:fea0:d613. May 6 16:14:01 caralu74 avahi-daemon[1468]: Interface eth0.IPv6 no longer relevant for mDNS. May 6 16:14:01 caralu74 NetworkManager[1568]: Activation (eth0) Stage 3 of 5 (IP Configure Start) complete. May 6 16:14:01 caralu74 dhclient: Internet Systems Consortium DHCP Client 4.1-ESV-R4 May 6 16:14:01 caralu74 dhclient: Copyright 2004-2011 Internet Systems Consortium. May 6 16:14:01 caralu74 dhclient: All rights reserved. May 6 16:14:01 caralu74 dhclient: For info, please visit https://www.isc.org/software/dhcp/ May 6 16:14:01 caralu74 dhclient: May 6 16:14:01 caralu74 NetworkManager[1568]: (eth0): DHCPv4 state changed nbi -> preinit May 6 16:14:01 caralu74 dhclient: Listening on LPF/eth0/00:19:db:a0:d6:13 May 6 16:14:01 caralu74 dhclient: Sending on LPF/eth0/00:19:db:a0:d6:13 May 6 16:14:01 caralu74 dhclient: Sending on Socket/fallback May 6 16:14:01 caralu74 dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3 May 6 16:14:02 caralu74 avahi-daemon[1468]: Joining mDNS multicast group on interface eth0.IPv6 with address fe80::219:dbff:fea0:d613. May 6 16:14:02 caralu74 avahi-daemon[1468]: New relevant interface eth0.IPv6 for mDNS. May 6 16:14:02 caralu74 avahi-daemon[1468]: Registering new address record for fe80::219:dbff:fea0:d613 on eth0.*. May 6 16:14:04 caralu74 dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 6 May 6 16:14:10 caralu74 dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8 May 6 16:14:11 caralu74 kernel: [ 199.096013] eth0: no IPv6 routers present May 6 16:14:18 caralu74 dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 20 May 6 16:14:21 caralu74 NetworkManager[1568]: (eth0): IP6 addrconf timed out or failed. May 6 16:14:21 caralu74 NetworkManager[1568]: Activation (eth0) Stage 4 of 5 (IPv6 Configure Timeout) scheduled... May 6 16:14:21 caralu74 NetworkManager[1568]: Activation (eth0) Stage 4 of 5 (IPv6 Configure Timeout) started... May 6 16:14:21 caralu74 NetworkManager[1568]: Activation (eth0) Stage 4 of 5 (IPv6 Configure Timeout) complete. May 6 16:14:38 caralu74 dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 7 May 6 16:14:45 caralu74 dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 15 May 6 16:14:46 caralu74 NetworkManager[1568]: (eth0): DHCPv4 request timed out. May 6 16:14:46 caralu74 NetworkManager[1568]: (eth0): canceled DHCP transaction, DHCP client pid 3078 May 6 16:14:46 caralu74 NetworkManager[1568]: Activation (eth0) Stage 4 of 5 (IPv4 Configure Timeout) scheduled... May 6 16:14:46 caralu74 NetworkManager[1568]: Activation (eth0) Stage 4 of 5 (IPv4 Configure Timeout) started... May 6 16:14:46 caralu74 NetworkManager[1568]: (eth0): device state change: ip-config -> failed (reason 'ip-config-unavailable') [70 120 5] May 6 16:14:46 caralu74 NetworkManager[1568]: Marking connection 'Conexión cableada 1' invalid. May 6 16:14:46 caralu74 NetworkManager[1568]: Activation (eth0) failed. May 6 16:14:46 caralu74 NetworkManager[1568]: Activation (eth0) Stage 4 of 5 (IPv4 Configure Timeout) complete. May 6 16:14:46 caralu74 NetworkManager[1568]: (eth0): device state change: failed -> disconnected (reason 'none') [120 30 0] May 6 16:14:46 caralu74 NetworkManager[1568]: (eth0): deactivating device (reason 'none') [0] May 6 16:14:46 caralu74 avahi-daemon[1468]: Withdrawing address record for fe80::219:dbff:fea0:d613 on eth0. May 6 16:14:46 caralu74 avahi-daemon[1468]: Leaving mDNS multicast group on interface eth0.IPv6 with address fe80::219:dbff:fea0:d613. May 6 16:14:46 caralu74 avahi-daemon[1468]: Interface eth0.IPv6 no longer relevant for mDNS. May 6 16:14:48 caralu74 avahi-daemon[1468]: Joining mDNS multicast group on interface eth0.IPv6 with address fe80::219:dbff:fea0:d613. May 6 16:14:48 caralu74 avahi-daemon[1468]: New relevant interface eth0.IPv6 for mDNS. May 6 16:14:48 caralu74 avahi-daemon[1468]: Registering new address record for fe80::219:dbff:fea0:d613 on eth0.*. ################################