[Linux-PowerEdge] How to kill idrac addresses fde1:53ba:e9a0:de11:* ?

Onno Zweers onno.zweers at surf.nl
Wed Jun 9 10:37:37 CDT 2021


Hi Shine,

That seems to work perfectly. Thanks!

[root at penguin1 ~]# ifconfig idrac
idrac: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 169.254.0.2  netmask 255.255.255.0  broadcast 169.254.0.255
        inet6 fde1:53ba:e9a0:de11:3648:edff:fee7:5fcb  prefixlen 64  scopeid 0x0<global>
        inet6 fe80::3648:edff:fee7:5fcb  prefixlen 64  scopeid 0x20<link>
        ether 34:48:ed:e7:5f:cb  txqueuelen 1000  (Ethernet)
        RX packets 71  bytes 7882 (7.6 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 20  bytes 2150 (2.0 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[root at penguin1 ~]# racadm set idrac.os-bmc.UsbNicULA ::
[Key=idrac.Embedded.1#OS-BMC.1]
Object value modified successfully

[root at penguin1 ~]# ifconfig idrac
idrac: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 169.254.0.2  netmask 255.255.255.0  broadcast 169.254.0.255
        inet6 fde1:53ba:e9a0:de11:3648:edff:fee7:5fcb  prefixlen 64  scopeid 0x0<global>
        inet6 fe80::3648:edff:fee7:5fcb  prefixlen 64  scopeid 0x20<link>
        ether 34:48:ed:e7:5f:cb  txqueuelen 1000  (Ethernet)
        RX packets 139  bytes 23674 (23.1 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 75  bytes 14459 (14.1 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[root at penguin1 ~]# nmcli device reapply idrac
Connection successfully reapplied to device 'idrac'.

[root at penguin1 ~]# ifconfig idrac
idrac: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 169.254.0.2  netmask 255.255.255.0  broadcast 169.254.0.255
        ether 34:48:ed:e7:5f:cb  txqueuelen 1000  (Ethernet)
        RX packets 223  bytes 40831 (39.8 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 172  bytes 29548 (28.8 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Cheers,
Onno


Op 09-06-2021 15:08 heeft KA, Shine <Shine.Ka at dell.com> geschreven:

    This interface virtual USB network interface used for OS to iDRAC Pass-through feature. Please refer below link for more details. 

    https://www.dell.com/support/manuals/en-us/idrac9-lifecycle-controller-v4.x-series/idrac9_4.00.00.00_ug_new/enabling-or-disabling-os-to-idrac-pass-through?guid=guid-25fc6820-9a01-4739-87c3-d2036b9adf80&lang=en-us

    If you do not want IPv6 on this interface you can run Racadm command "racadm set idrac.os-bmc.UsbNicULA ::" to disable IPv6 address on this interface. Once you run this command you need to disable and enable the interface to apply the changes.


    Thanks & Regards
    Shine KA

    -----Original Message-----
    From: Linux-PowerEdge <linux-poweredge-bounces at dell.com> On Behalf Of Onno Zweers
    Sent: Wednesday, June 9, 2021 6:06 PM
    To: linux-poweredge at lists.us.dell.com
    Subject: [Linux-PowerEdge] How to kill idrac addresses fde1:53ba:e9a0:de11:* ?

    Hi everyone,

    With our new iDrac9 poweredges we notice that Centos 8 lists a specific IPv6 address for the iDrac.


    [root at penguin1 ~]# ifconfig idrac

    idrac: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500

            inet 169.254.0.2  netmask 255.255.255.0  broadcast 169.254.0.255

            inet6 fde1:53ba:e9a0:de11:3648:edff:fee7:5fcb  prefixlen 64  scopeid 0x0<global>

            ether 34:48:ed:e7:5f:cb  txqueuelen 1000  (Ethernet)

            RX packets 717841  bytes 52346458 (49.9 MiB)

            RX errors 0  dropped 0  overruns 0  frame 0

            TX packets 940803  bytes 77477775 (73.8 MiB)

            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

    As the forth segment is “de11”, I assume it’s a Dell specific thing.

    The problem is that we have an application that gets confused by this and thinks it can use this address for normal traffic (as it is not private IP space).

    I’ve been trying to turn the address off, but have not been very successful. In the iDrac web interface I can’t see this address anywhere, and the IPv6 setting for iDrac is disabled. In the OS, I can remove the IPv6 address like this:


    nmcli dev mod idrac ipv6.method ignore ; nmcli device reapply idrac

    But after a few minutes it returns.

    Does anyone know where this address comes from, and how to turn it off reliably?

    Kind regards,
    Onno
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