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the network interface has been lost

    Question

  • Hello,

    I have a Hyper-V host and network storage which is connected to that host via two network cards using iSCSI and MPIO.
    After an updating 2-3 weeks ago I noticed that one interface has disappeared. Ipconfig and netsh don't see it.

    ipconfig /all
    Windows IP Configuration
    
       Host Name . . . . . . . . . . . . : HYPER-1
       Primary Dns Suffix  . . . . . . . : 
       Node Type . . . . . . . . . . . . : Hybrid
       IP Routing Enabled. . . . . . . . : No
       WINS Proxy Enabled. . . . . . . . : No
       DNS Suffix Search List. . . . . . : 
    
    Ethernet adapter LAN2:
    
       Connection-specific DNS Suffix  . :
       Description . . . . . . . . . . . : Intel(R) 82574L Gigabit Network Connection #2
       Physical Address. . . . . . . . . : 0C-C4-7A-4A-9B-F9
       DHCP Enabled. . . . . . . . . . . : No
       Autoconfiguration Enabled . . . . : Yes
       Link-local IPv6 Address . . . . . : fe80::b171:f50e:3747:d4fc%13(Preferred)
       IPv4 Address. . . . . . . . . . . : 10.255.9.12(Preferred)
       Subnet Mask . . . . . . . . . . . : 255.255.255.0
       Default Gateway . . . . . . . . . :
       DHCPv6 IAID . . . . . . . . . . . : 369935482
       DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1D-23-01-4F-0C-C4-7A-4A-9B-F8
       DNS Servers . . . . . . . . . . . : 10.255.9.11
       NetBIOS over Tcpip. . . . . . . . : Enabled
    netsh interface ipv4 show interfaces
    Idx     Met         MTU          State                Name
    ---  ----------  ----------  ------------  ---------------------------
      1          50  4294967295  connected     Loopback Pseudo-Interface 1
     13          10        1500  connected     LAN2
    get-wmiobject win32_networkadapter | select netconnectionid, name, InterfaceIndex, netconnectionstatus
    netconnectionid                              name                                                                       InterfaceIndex netconnectionstatus
    ---------------                              ----                                                                       -------------- -------------------
    LAN1                                         Intel(R) 82574L Gigabit Network Connection                                             12 2
    LAN2                                         Intel(R) 82574L Gigabit Network Connectio...                                           13 2
    Get-NetAdapter
    Name                      InterfaceDescription                    ifIndex Status       MacAddress             LinkSpeed
    ----                      --------------------                    ------- ------       ----------             ---------
                              Hyper-V Virtual Ethernet Adapter #2                                                     0 bps
    LAN2                      Intel(R) 82574L Gigabit Network Co...#2      13 Up           0C-C4-7A-4A-9B-F9         1 Gbps
    LAN1                      Intel(R) 82574L Gigabit Network Conn...      12 Up           0C-C4-7A-4A-9B-F8         1 Gbps

    I tried to disable and enable this interface but the server got disconnected:

    Disable-NetAdapter -Name LAN1
    
    Confirm
    Are you sure you want to perform this action?
    Disable-NetAdapter 'LAN1'
    [Y] Yes  [A] Yes to All  [N] No  [L] No to All  [?] Help (default is "Y"):
    WARNING: The network connection to hyper-1 has been interrupted. Attempting to reconnect for up to 4 minutes...
    WARNING: Attempting to reconnect to hyper-1 ...
    WARNING: The network connection to hyper-1 has been restored.

    Now I have problems with my backup task and many iSCSI errors:

    How can I bring this interface back?
    Can I remove this interface from MPIO without any interruptions?

    Also MCS configured as Round Robin. Should I change it?

    Thank you in advance!

    Wednesday, May 30, 2018 11:14 AM

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