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today I faced a problem: my wired connection suddenly stop working, a problem like this was a month before, but on a next day problem was solved dunno why. Also sometimes it takes nearly 10 minutes to connect, but it worked after all. Here my log and other info:

tail syslog:

May 5 15:34:37 rendal-pc avahi-daemon[666]: Withdrawing address record for fe80::ca60:ff:fec5:c725 on eth0.

May 5 15:34:37 rendal-pc avahi-daemon[666]: Leaving mDNS multicast group on interface eth0.IPv6 with address fe80::ca60:ff:fec5:c725. May 5 15:34:37 rendal-pc avahi-daemon[666]: Interface eth0.IPv6 no longer relevant for mDNS.

May 5 15:34:38 rendal-pc avahi-daemon[666]: Joining mDNS multicast group on interface eth0.IPv6 with address fe80::ca60:ff:fec5:c725.

May 5 15:34:38 rendal-pc avahi-daemon[666]: New relevant interface eth0.IPv6 for mDNS.

May 5 15:34:38 rendal-pc avahi-daemon[666]: Registering new address record for fe80::ca60:ff:fec5:c725 on eth0.*. May 5 15:34:40 rendal-pc NetworkManager[1283]: Auto-activating connection 'Wired connection 1'.

May 5 15:34:40 rendal-pc NetworkManager[1283]: Activation (eth0) starting connection 'Wired connection 1'

May 5 15:34:40 rendal-pc NetworkManager[1283]: (eth0): device state change: disconnected -> prepare (reason 'none') [30 40 0]

May 5 15:34:40 rendal-pc NetworkManager[1283]: Activation (eth0) Stage 1 of 5 (Device Prepare) scheduled...

May 5 15:34:40 rendal-pc NetworkManager[1283]: Activation (eth0) Stage 1 of 5 (Device Prepare) started...

May 5 15:34:40 rendal-pc NetworkManager[1283]: Activation (eth0) Stage 2 of 5 (Device Configure) scheduled...

May 5 15:34:40 rendal-pc NetworkManager[1283]: Activation (eth0) Stage 1 of 5 (Device Prepare) complete.

May 5 15:34:40 rendal-pc NetworkManager[1283]: Activation (eth0) Stage 2 of 5 (Device Configure) starting... May 5 15:34:40 rendal-pc NetworkManager[1283]: (eth0): device state change: prepare -> config (reason 'none') [40 50 0]

May 5 15:34:40 rendal-pc NetworkManager[1283]: Activation (eth0) Stage 2 of 5 (Device Configure) successful.

May 5 15:34:40 rendal-pc NetworkManager[1283]: Activation (eth0) Stage 3 of 5 (IP Configure Start) scheduled.

May 5 15:34:40 rendal-pc NetworkManager[1283]: Activation (eth0) Stage 2 of 5 (Device Configure) complete.

May 5 15:34:40 rendal-pc NetworkManager[1283]: Activation (eth0) Stage 3 of 5 (IP Configure Start) started... May 5 15:34:40 rendal-pc NetworkManager[1283]: (eth0): device state change: config -> ip-config (reason 'none') [50 70 0]

May 5 15:34:40 rendal-pc NetworkManager[1283]: Activation (eth0) Beginning DHCPv4 transaction (timeout in 45 seconds)

May 5 15:34:40 rendal-pc NetworkManager[1283]: dhclient started with pid 7078

May 5 15:34:40 rendal-pc dhclient: Internet Systems Consortium DHCP Client 4.1-ESV-R4

May 5 15:34:40 rendal-pc dhclient: Copyright 2004-2011 Internet Systems Consortium.

May 5 15:34:40 rendal-pc dhclient: All rights reserved.

May 5 15:34:40 rendal-pc dhclient: For info, please visit https://www.isc.org/software/dhcp/ May 5 15:34:40 rendal-pc dhclient:

May 5 15:34:40 rendal-pc NetworkManager[1283]: Activation (eth0) Beginning IP6 addrconf.

May 5 15:34:40 rendal-pc avahi-daemon[666]: Withdrawing address record for fe80::ca60:ff:fec5:c725 on eth0.

May 5 15:34:40 rendal-pc avahi-daemon[666]: Leaving mDNS multicast group on interface eth0.IPv6 with address fe80::ca60:ff:fec5:c725.

May 5 15:34:40 rendal-pc avahi-daemon[666]: Interface eth0.IPv6 no longer relevant for mDNS.

May 5 15:34:40 rendal-pc NetworkManager[1283]: Activation (eth0) Stage 3 of 5 (IP Configure Start) complete.

May 5 15:34:40 rendal-pc NetworkManager[1283]: (eth0): DHCPv4 state changed nbi -> preinit

May 5 15:34:40 rendal-pc dhclient: Listening on LPF/eth0/c8:60:00:c5:c7:25

May 5 15:34:40 rendal-pc dhclient: Sending on
LPF/eth0/c8:60:00:c5:c7:25

May 5 15:34:40 rendal-pc dhclient: Sending on Socket/fallback

May 5 15:34:40 rendal-pc dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3

May 5 15:34:41 rendal-pc avahi-daemon[666]: Joining mDNS multicast group on interface eth0.IPv6 with address fe80::ca60:ff:fec5:c725.

May 5 15:34:41 rendal-pc avahi-daemon[666]: New relevant interface eth0.IPv6 for mDNS.

May 5 15:34:41 rendal-pc avahi-daemon[666]: Registering new address record for fe80::ca60:ff:fec5:c725 on eth0.*.

May 5 15:34:43 rendal-pc dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 4

May 5 15:34:47 rendal-pc dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 5

May 5 15:34:50 rendal-pc kernel: [ 436.617970] eth0: no IPv6 routers present

May 5 15:34:52 rendal-pc dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 5

May 5 15:34:57 rendal-pc dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8

May 5 15:35:00 rendal-pc NetworkManager[1283]: (eth0): IP6 addrconf timed out or failed.

May 5 15:35:00 rendal-pc NetworkManager[1283]: Activation (eth0) Stage 4 of 5 (IPv6 Configure Timeout) scheduled...

May 5 15:35:00 rendal-pc NetworkManager[1283]: Activation (eth0) Stage 4 of 5 (IPv6 Configure Timeout) started...

May 5 15:35:00 rendal-pc NetworkManager[1283]: Activation (eth0) Stage 4 of 5 (IPv6 Configure Timeout) complete.

May 5 15:35:05 rendal-pc dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 12

ifconfig:

eth0 Link encap:Ethernet HWaddr c8:60:00:c5:c7:25

      inet6 addr: fe80::ca60:ff:fec5:c725/64 Scope:Link

      UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

      RX packets:378 errors:0 dropped:29 overruns:0 frame:0

      TX packets:335 errors:0 dropped:0 overruns:0 carrier:0

      collisions:0 txqueuelen:1000 

      RX bytes:31758 (31.7 KB)  TX bytes:75293 (75.2 KB)

      Interrupt:49 Base address:0xa000 

lo Link encap:Local Loopback

      inet addr:127.0.0.1  Mask:255.0.0.0

      inet6 addr: ::1/128 Scope:Host

      UP LOOPBACK RUNNING  MTU:16436  Metric:1

      RX packets:4 errors:0 dropped:0 overruns:0 frame:0

      TX packets:4 errors:0 dropped:0 overruns:0 carrier:0

      collisions:0 txqueuelen:0 

      RX bytes:200 (200.0 B)  TX bytes:200 (200.0 B)

sudo nm-tool:

State: connecting

  • Device: eth0 [Wired connection 1] -------------------------------------------

    Type: Wired

    Driver: r8169

    State: connecting (getting IP configuration)

    Default: no

    HW Address: C8:60:00:C5:C7:25

    Capabilities:

    Carrier Detect: yes

    Speed: 100 Mb/s

    Wired Properties

    Carrier: on

dmesg | grep eth0:

[ 1.544102] r8169 0000:03:00.0: eth0: RTL8168f/8111f at 0xffffc900065ca000, c8:60:00:c5:c7:25, XID 08000800 IRQ 49

[ 1.544104] r8169 0000:03:00.0: eth0: jumbo features [frames: 9200 bytes, tx checksumming: ko]

[ 7.116865] ADDRCONF(NETDEV_UP): eth0: link is not ready

[ 18.299863] r8169 0000:03:00.0: eth0: link down

[ 18.299892] r8169 0000:03:00.0: eth0: link down

[ 18.300537] ADDRCONF(NETDEV_UP): eth0: link is not ready

[ 18.300700] ADDRCONF(NETDEV_UP): eth0: link is not ready

[ 19.914304] r8169 0000:03:00.0: eth0: link up

[ 19.915012] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready

[ 30.170800] eth0: no IPv6 routers present

[ 78.593506] eth0: no IPv6 routers present

[ 330.021563] r8169 0000:03:00.0: eth0: link down

[ 330.021571] r8169 0000:03:00.0: eth0: link down

[ 330.023004] ADDRCONF(NETDEV_UP): eth0: link is not ready

[ 331.617972] r8169 0000:03:00.0: eth0: link up

[ 331.619369] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready

also I tried a different solutions but no luck here. wired connection would work when i changed ip6 to local-only, but in this case i cant establish my l2tp inet connection.

Sorry for such long post.

Thanks in advance.

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