2 LAN cables connected, 1 PCI bus and vice versa

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When booting my pc with 2 LAN cables connected only one interface is registered.



03:00.0 and 04:00.0



$ dmesg | grep -P '0(3|4):00.0'
[ 0.180140] pci 0000:04:00.0: [11ab:4362] type 00 class 0x020000
[ 0.180181] pci 0000:04:00.0: reg 0x10: [mem 0xfa8fc000-0xfa8fffff 64bit]
[ 0.180193] pci 0000:04:00.0: reg 0x18: [io 0xb800-0xb8ff]
[ 0.180233] pci 0000:04:00.0: reg 0x30: [mem 0xfa8c0000-0xfa8dffff pref]
[ 0.180277] pci 0000:04:00.0: supports D1 D2
[ 0.180279] pci 0000:04:00.0: PME# supported from D0 D1 D2 D3hot D3cold
[ 0.180337] pci 0000:04:00.0: disabling ASPM on pre-1.1 PCIe device. You can enable it with 'pcie_aspm=force'
[ 2.077454] sky2 0000:04:00.0: Yukon-2 EC chip revision 2
[ 2.080310] sky2 0000:04:00.0 eth0: addr 00:00:00:00:66:b6
[ 2.147949] sky2 0000:04:00.0 enp4s0: renamed from eth0
[ 18.815400] sky2 0000:04:00.0 enp4s0: enabling interface
[ 21.829377] sky2 0000:04:00.0 enp4s0: Link is up at 1000 Mbps, full duplex, flow control both


When I boot the server with one cable both interfaces are found and can be used by plugging in the second cable.



$ dmesg | grep -P '0(3|4):00.0'
[ 0.180140] pci 0000:04:00.0: [11ab:4362] type 00 class 0x020000
[ 0.180182] pci 0000:04:00.0: reg 0x10: [mem 0xfa8fc000-0xfa8fffff 64bit]
[ 0.180193] pci 0000:04:00.0: reg 0x18: [io 0xb800-0xb8ff]
[ 0.180233] pci 0000:04:00.0: reg 0x30: [mem 0xfa8c0000-0xfa8dffff pref]
[ 0.180277] pci 0000:04:00.0: supports D1 D2
[ 0.180280] pci 0000:04:00.0: PME# supported from D0 D1 D2 D3hot D3cold
[ 0.180338] pci 0000:04:00.0: disabling ASPM on pre-1.1 PCIe device. You can enable it with 'pcie_aspm=force'
[ 0.180424] pci 0000:03:00.0: [11ab:4362] type 00 class 0x020000
[ 0.180465] pci 0000:03:00.0: reg 0x10: [mem 0xfa7fc000-0xfa7fffff 64bit]
[ 0.180476] pci 0000:03:00.0: reg 0x18: [io 0xa800-0xa8ff]
[ 0.180516] pci 0000:03:00.0: reg 0x30: [mem 0xfa7c0000-0xfa7dffff pref]
[ 0.180559] pci 0000:03:00.0: supports D1 D2
[ 0.180562] pci 0000:03:00.0: PME# supported from D0 D1 D2 D3hot D3cold
[ 0.180620] pci 0000:03:00.0: disabling ASPM on pre-1.1 PCIe device. You can enable it with 'pcie_aspm=force'
[ 2.062437] sky2 0000:04:00.0: Yukon-2 EC chip revision 2
[ 2.064723] sky2 0000:04:00.0 eth0: addr 00:00:00:00:66:b6
[ 2.068332] sky2 0000:03:00.0: Yukon-2 EC chip revision 2
[ 2.070348] sky2 0000:03:00.0 eth1: addr 00:00:00:00:62:84
[ 2.140054] sky2 0000:04:00.0 enp4s0: renamed from eth0
[ 2.256554] sky2 0000:03:00.0 enp3s0: renamed from eth1
[ 19.799013] sky2 0000:04:00.0 enp4s0: enabling interface
[ 19.801113] sky2 0000:03:00.0 enp3s0: enabling interface
[ 22.727625] sky2 0000:04:00.0 enp4s0: Link is up at 1000 Mbps, full duplex, flow control both
[ 412.644094] sky2 0000:03:00.0 enp3s0: Link is up at 1000 Mbps, full duplex, flow control both


What steps could I take to debug this further?



Extra info:
Motherboard: Asus P5W DH Deluxe
Chipset: marvell Yukon 88E8053
Drivers used(auto): sky2

$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.5 LTS"
Kernel: 4.4.0-138-generic








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    When booting my pc with 2 LAN cables connected only one interface is registered.



    03:00.0 and 04:00.0



    $ dmesg | grep -P '0(3|4):00.0'
    [ 0.180140] pci 0000:04:00.0: [11ab:4362] type 00 class 0x020000
    [ 0.180181] pci 0000:04:00.0: reg 0x10: [mem 0xfa8fc000-0xfa8fffff 64bit]
    [ 0.180193] pci 0000:04:00.0: reg 0x18: [io 0xb800-0xb8ff]
    [ 0.180233] pci 0000:04:00.0: reg 0x30: [mem 0xfa8c0000-0xfa8dffff pref]
    [ 0.180277] pci 0000:04:00.0: supports D1 D2
    [ 0.180279] pci 0000:04:00.0: PME# supported from D0 D1 D2 D3hot D3cold
    [ 0.180337] pci 0000:04:00.0: disabling ASPM on pre-1.1 PCIe device. You can enable it with 'pcie_aspm=force'
    [ 2.077454] sky2 0000:04:00.0: Yukon-2 EC chip revision 2
    [ 2.080310] sky2 0000:04:00.0 eth0: addr 00:00:00:00:66:b6
    [ 2.147949] sky2 0000:04:00.0 enp4s0: renamed from eth0
    [ 18.815400] sky2 0000:04:00.0 enp4s0: enabling interface
    [ 21.829377] sky2 0000:04:00.0 enp4s0: Link is up at 1000 Mbps, full duplex, flow control both


    When I boot the server with one cable both interfaces are found and can be used by plugging in the second cable.



    $ dmesg | grep -P '0(3|4):00.0'
    [ 0.180140] pci 0000:04:00.0: [11ab:4362] type 00 class 0x020000
    [ 0.180182] pci 0000:04:00.0: reg 0x10: [mem 0xfa8fc000-0xfa8fffff 64bit]
    [ 0.180193] pci 0000:04:00.0: reg 0x18: [io 0xb800-0xb8ff]
    [ 0.180233] pci 0000:04:00.0: reg 0x30: [mem 0xfa8c0000-0xfa8dffff pref]
    [ 0.180277] pci 0000:04:00.0: supports D1 D2
    [ 0.180280] pci 0000:04:00.0: PME# supported from D0 D1 D2 D3hot D3cold
    [ 0.180338] pci 0000:04:00.0: disabling ASPM on pre-1.1 PCIe device. You can enable it with 'pcie_aspm=force'
    [ 0.180424] pci 0000:03:00.0: [11ab:4362] type 00 class 0x020000
    [ 0.180465] pci 0000:03:00.0: reg 0x10: [mem 0xfa7fc000-0xfa7fffff 64bit]
    [ 0.180476] pci 0000:03:00.0: reg 0x18: [io 0xa800-0xa8ff]
    [ 0.180516] pci 0000:03:00.0: reg 0x30: [mem 0xfa7c0000-0xfa7dffff pref]
    [ 0.180559] pci 0000:03:00.0: supports D1 D2
    [ 0.180562] pci 0000:03:00.0: PME# supported from D0 D1 D2 D3hot D3cold
    [ 0.180620] pci 0000:03:00.0: disabling ASPM on pre-1.1 PCIe device. You can enable it with 'pcie_aspm=force'
    [ 2.062437] sky2 0000:04:00.0: Yukon-2 EC chip revision 2
    [ 2.064723] sky2 0000:04:00.0 eth0: addr 00:00:00:00:66:b6
    [ 2.068332] sky2 0000:03:00.0: Yukon-2 EC chip revision 2
    [ 2.070348] sky2 0000:03:00.0 eth1: addr 00:00:00:00:62:84
    [ 2.140054] sky2 0000:04:00.0 enp4s0: renamed from eth0
    [ 2.256554] sky2 0000:03:00.0 enp3s0: renamed from eth1
    [ 19.799013] sky2 0000:04:00.0 enp4s0: enabling interface
    [ 19.801113] sky2 0000:03:00.0 enp3s0: enabling interface
    [ 22.727625] sky2 0000:04:00.0 enp4s0: Link is up at 1000 Mbps, full duplex, flow control both
    [ 412.644094] sky2 0000:03:00.0 enp3s0: Link is up at 1000 Mbps, full duplex, flow control both


    What steps could I take to debug this further?



    Extra info:
    Motherboard: Asus P5W DH Deluxe
    Chipset: marvell Yukon 88E8053
    Drivers used(auto): sky2

    $ cat /etc/lsb-release
    DISTRIB_ID=Ubuntu
    DISTRIB_RELEASE=16.04
    DISTRIB_CODENAME=xenial
    DISTRIB_DESCRIPTION="Ubuntu 16.04.5 LTS"
    Kernel: 4.4.0-138-generic








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      up vote
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      down vote

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      up vote
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      down vote

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      When booting my pc with 2 LAN cables connected only one interface is registered.



      03:00.0 and 04:00.0



      $ dmesg | grep -P '0(3|4):00.0'
      [ 0.180140] pci 0000:04:00.0: [11ab:4362] type 00 class 0x020000
      [ 0.180181] pci 0000:04:00.0: reg 0x10: [mem 0xfa8fc000-0xfa8fffff 64bit]
      [ 0.180193] pci 0000:04:00.0: reg 0x18: [io 0xb800-0xb8ff]
      [ 0.180233] pci 0000:04:00.0: reg 0x30: [mem 0xfa8c0000-0xfa8dffff pref]
      [ 0.180277] pci 0000:04:00.0: supports D1 D2
      [ 0.180279] pci 0000:04:00.0: PME# supported from D0 D1 D2 D3hot D3cold
      [ 0.180337] pci 0000:04:00.0: disabling ASPM on pre-1.1 PCIe device. You can enable it with 'pcie_aspm=force'
      [ 2.077454] sky2 0000:04:00.0: Yukon-2 EC chip revision 2
      [ 2.080310] sky2 0000:04:00.0 eth0: addr 00:00:00:00:66:b6
      [ 2.147949] sky2 0000:04:00.0 enp4s0: renamed from eth0
      [ 18.815400] sky2 0000:04:00.0 enp4s0: enabling interface
      [ 21.829377] sky2 0000:04:00.0 enp4s0: Link is up at 1000 Mbps, full duplex, flow control both


      When I boot the server with one cable both interfaces are found and can be used by plugging in the second cable.



      $ dmesg | grep -P '0(3|4):00.0'
      [ 0.180140] pci 0000:04:00.0: [11ab:4362] type 00 class 0x020000
      [ 0.180182] pci 0000:04:00.0: reg 0x10: [mem 0xfa8fc000-0xfa8fffff 64bit]
      [ 0.180193] pci 0000:04:00.0: reg 0x18: [io 0xb800-0xb8ff]
      [ 0.180233] pci 0000:04:00.0: reg 0x30: [mem 0xfa8c0000-0xfa8dffff pref]
      [ 0.180277] pci 0000:04:00.0: supports D1 D2
      [ 0.180280] pci 0000:04:00.0: PME# supported from D0 D1 D2 D3hot D3cold
      [ 0.180338] pci 0000:04:00.0: disabling ASPM on pre-1.1 PCIe device. You can enable it with 'pcie_aspm=force'
      [ 0.180424] pci 0000:03:00.0: [11ab:4362] type 00 class 0x020000
      [ 0.180465] pci 0000:03:00.0: reg 0x10: [mem 0xfa7fc000-0xfa7fffff 64bit]
      [ 0.180476] pci 0000:03:00.0: reg 0x18: [io 0xa800-0xa8ff]
      [ 0.180516] pci 0000:03:00.0: reg 0x30: [mem 0xfa7c0000-0xfa7dffff pref]
      [ 0.180559] pci 0000:03:00.0: supports D1 D2
      [ 0.180562] pci 0000:03:00.0: PME# supported from D0 D1 D2 D3hot D3cold
      [ 0.180620] pci 0000:03:00.0: disabling ASPM on pre-1.1 PCIe device. You can enable it with 'pcie_aspm=force'
      [ 2.062437] sky2 0000:04:00.0: Yukon-2 EC chip revision 2
      [ 2.064723] sky2 0000:04:00.0 eth0: addr 00:00:00:00:66:b6
      [ 2.068332] sky2 0000:03:00.0: Yukon-2 EC chip revision 2
      [ 2.070348] sky2 0000:03:00.0 eth1: addr 00:00:00:00:62:84
      [ 2.140054] sky2 0000:04:00.0 enp4s0: renamed from eth0
      [ 2.256554] sky2 0000:03:00.0 enp3s0: renamed from eth1
      [ 19.799013] sky2 0000:04:00.0 enp4s0: enabling interface
      [ 19.801113] sky2 0000:03:00.0 enp3s0: enabling interface
      [ 22.727625] sky2 0000:04:00.0 enp4s0: Link is up at 1000 Mbps, full duplex, flow control both
      [ 412.644094] sky2 0000:03:00.0 enp3s0: Link is up at 1000 Mbps, full duplex, flow control both


      What steps could I take to debug this further?



      Extra info:
      Motherboard: Asus P5W DH Deluxe
      Chipset: marvell Yukon 88E8053
      Drivers used(auto): sky2

      $ cat /etc/lsb-release
      DISTRIB_ID=Ubuntu
      DISTRIB_RELEASE=16.04
      DISTRIB_CODENAME=xenial
      DISTRIB_DESCRIPTION="Ubuntu 16.04.5 LTS"
      Kernel: 4.4.0-138-generic








      share







      New contributor




      Keuvie is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      When booting my pc with 2 LAN cables connected only one interface is registered.



      03:00.0 and 04:00.0



      $ dmesg | grep -P '0(3|4):00.0'
      [ 0.180140] pci 0000:04:00.0: [11ab:4362] type 00 class 0x020000
      [ 0.180181] pci 0000:04:00.0: reg 0x10: [mem 0xfa8fc000-0xfa8fffff 64bit]
      [ 0.180193] pci 0000:04:00.0: reg 0x18: [io 0xb800-0xb8ff]
      [ 0.180233] pci 0000:04:00.0: reg 0x30: [mem 0xfa8c0000-0xfa8dffff pref]
      [ 0.180277] pci 0000:04:00.0: supports D1 D2
      [ 0.180279] pci 0000:04:00.0: PME# supported from D0 D1 D2 D3hot D3cold
      [ 0.180337] pci 0000:04:00.0: disabling ASPM on pre-1.1 PCIe device. You can enable it with 'pcie_aspm=force'
      [ 2.077454] sky2 0000:04:00.0: Yukon-2 EC chip revision 2
      [ 2.080310] sky2 0000:04:00.0 eth0: addr 00:00:00:00:66:b6
      [ 2.147949] sky2 0000:04:00.0 enp4s0: renamed from eth0
      [ 18.815400] sky2 0000:04:00.0 enp4s0: enabling interface
      [ 21.829377] sky2 0000:04:00.0 enp4s0: Link is up at 1000 Mbps, full duplex, flow control both


      When I boot the server with one cable both interfaces are found and can be used by plugging in the second cable.



      $ dmesg | grep -P '0(3|4):00.0'
      [ 0.180140] pci 0000:04:00.0: [11ab:4362] type 00 class 0x020000
      [ 0.180182] pci 0000:04:00.0: reg 0x10: [mem 0xfa8fc000-0xfa8fffff 64bit]
      [ 0.180193] pci 0000:04:00.0: reg 0x18: [io 0xb800-0xb8ff]
      [ 0.180233] pci 0000:04:00.0: reg 0x30: [mem 0xfa8c0000-0xfa8dffff pref]
      [ 0.180277] pci 0000:04:00.0: supports D1 D2
      [ 0.180280] pci 0000:04:00.0: PME# supported from D0 D1 D2 D3hot D3cold
      [ 0.180338] pci 0000:04:00.0: disabling ASPM on pre-1.1 PCIe device. You can enable it with 'pcie_aspm=force'
      [ 0.180424] pci 0000:03:00.0: [11ab:4362] type 00 class 0x020000
      [ 0.180465] pci 0000:03:00.0: reg 0x10: [mem 0xfa7fc000-0xfa7fffff 64bit]
      [ 0.180476] pci 0000:03:00.0: reg 0x18: [io 0xa800-0xa8ff]
      [ 0.180516] pci 0000:03:00.0: reg 0x30: [mem 0xfa7c0000-0xfa7dffff pref]
      [ 0.180559] pci 0000:03:00.0: supports D1 D2
      [ 0.180562] pci 0000:03:00.0: PME# supported from D0 D1 D2 D3hot D3cold
      [ 0.180620] pci 0000:03:00.0: disabling ASPM on pre-1.1 PCIe device. You can enable it with 'pcie_aspm=force'
      [ 2.062437] sky2 0000:04:00.0: Yukon-2 EC chip revision 2
      [ 2.064723] sky2 0000:04:00.0 eth0: addr 00:00:00:00:66:b6
      [ 2.068332] sky2 0000:03:00.0: Yukon-2 EC chip revision 2
      [ 2.070348] sky2 0000:03:00.0 eth1: addr 00:00:00:00:62:84
      [ 2.140054] sky2 0000:04:00.0 enp4s0: renamed from eth0
      [ 2.256554] sky2 0000:03:00.0 enp3s0: renamed from eth1
      [ 19.799013] sky2 0000:04:00.0 enp4s0: enabling interface
      [ 19.801113] sky2 0000:03:00.0 enp3s0: enabling interface
      [ 22.727625] sky2 0000:04:00.0 enp4s0: Link is up at 1000 Mbps, full duplex, flow control both
      [ 412.644094] sky2 0000:03:00.0 enp3s0: Link is up at 1000 Mbps, full duplex, flow control both


      What steps could I take to debug this further?



      Extra info:
      Motherboard: Asus P5W DH Deluxe
      Chipset: marvell Yukon 88E8053
      Drivers used(auto): sky2

      $ cat /etc/lsb-release
      DISTRIB_ID=Ubuntu
      DISTRIB_RELEASE=16.04
      DISTRIB_CODENAME=xenial
      DISTRIB_DESCRIPTION="Ubuntu 16.04.5 LTS"
      Kernel: 4.4.0-138-generic






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