Cannot get this Intel (Dell Branded) X520 Dual port SFP+ NIC working

D

dastrix80

New Member
Oct 25, 2025
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Hi All,

I have the card inserted into a fresh latest stable of Proxmox and using this Dell branded Intel card with a genuine Cisco 10Gbit LR SFP+ module

running lspci I can see the card:

Code: 
86:00.0 Ethernet controller: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection (rev 01)
86:00.1 Ethernet controller: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection (rev 01)

But I do not actually see the interface names for each port.

ip addr shows my onboard 1/2,5GB nic working but not the 10Gbit ones

Code: 
root@home:~# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host noprefixroute
       valid_lft forever preferred_lft forever
2: enp132s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel master vmbr0 state UP group default qlen 1000
    link/ether 60:cf:84:64:ae:13 brd ff:ff:ff:ff:ff:ff
    altname enx60cf8464ae13
3: vmbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 60:cf:84:64:ae:13 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.9/24 scope global vmbr0
       valid_lft forever preferred_lft forever
    inet6 fe80::62cf:84ff:fe64:ae13/64 scope link proto kernel_ll
       valid_lft forever preferred_lft forever
4: tap100i0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc fq_codel master fwbr100i0 state UNKNOWN group default qlen 1000
    link/ether 5e:81:24:bf:b2:88 brd ff:ff:ff:ff:ff:ff
5: fwbr100i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether ce:7f:73:35:a9:20 brd ff:ff:ff:ff:ff:ff
6: fwpr100p0@fwln100i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr0 state UP group default qlen 1000
    link/ether 5a:d2:58:d7:bd:d6 brd ff:ff:ff:ff:ff:ff
7: fwln100i0@fwpr100p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr100i0 state UP group default qlen 1000
    link/ether ce:7f:73:35:a9:20 brd ff:ff:ff:ff:ff:ff
8: tap101i0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc fq_codel master fwbr101i0 state UNKNOWN group default qlen 1000
    link/ether 6a:b3:f0:e6:be:ff brd ff:ff:ff:ff:ff:ff
9: fwbr101i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether d6:5c:07:1a:4c:62 brd ff:ff:ff:ff:ff:ff
10: fwpr101p0@fwln101i0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr0 state UP group default qlen 1000
    link/ether 5a:07:5c:3c:82:f1 brd ff:ff:ff:ff:ff:ff
11: fwln101i0@fwpr101p0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master fwbr101i0 state UP group default qlen 1000
    link/ether d6:5c:07:1a:4c:62 brd ff:ff:ff:ff:ff:ff
12: veth103i0@if2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master vmbr0 state UP group default qlen 1000
    link/ether fe:d9:d7:e4:8b:ce brd ff:ff:ff:ff:ff:ff link-netnsid 0
root@home:~#

I also ran this:


root@home:~# lsmod | grep ixgbe
ixgbe 483328 0
xfrm_algo 16384 1 ixgbe
mdio 12288 1 ixgbe
dca 16384 1 ixgbe
root@home:~#

Further, I can see the card interfaces are 'UNCLAIMED' running this command:

Code: 
sudo lshw -C network

*-network:0 UNCLAIMED
       description: Ethernet controller
       product: 82599ES 10-Gigabit SFI/SFP+ Network Connection
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:86:00.0
       version: 01
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi msix pciexpress cap_list
       configuration: latency=0
       resources: ioport:3020(size=32) memory:b8580000-b85fffff memory:8000600000-80006fffff memory:8000500000-80005fffff
  *-network:1 UNCLAIMED
       description: Ethernet controller
       product: 82599ES 10-Gigabit SFI/SFP+ Network Connection
       vendor: Intel Corporation
       physical id: 0.1
       bus info: pci@0000:86:00.1
       version: 01
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi msix pciexpress cap_list
       configuration: latency=0
       resources: ioport:3000(size=32) memory:b8500000-b857ffff memory:8000400000-80004fffff memory:8000300000-80003fffff

I can see a link light on my switch for this... so I ran this command

root@home:/dev# lspci -k | sed -n '/Ethernet/,/Kernel modules/p'

Code: 
84:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8125 2.5GbE Controller (rev 0c)

        Subsystem: ASUSTeK Computer Inc. Device 88e1

        Kernel driver in use: r8169

        Kernel modules: r8169

86:00.0 Ethernet controller: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection (rev 01)

        Subsystem: Intel Corporation Ethernet Server Adapter X520-2

        Kernel modules: ixgbe

86:00.1 Ethernet controller: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection (rev 01)

        Subsystem: Intel Corporation Ethernet Server Adapter X520-2

        Kernel modules: ixgbe

root@home:/dev#



Can someone point me in the right direction, I've added a line to the grub file to allow unsupported SFPS but it makes no different. I dont understand why i dont see the interface names

I think its these probing errors -5 on ixgbe that are the issue. I cant find anything about error 5

<CODE>
root@home:~# dmesg | grep ixgbe
[ 0.000000] Command line: BOOT_IMAGE=/vmlinuz-6.14.11-4-pve root=ZFS=/ROOT/pve-1 ro root=ZFS=rpool/ROOT/pve-1 boot=zfs quiet intel_iommu=on iommu=pt, quiet ixgbe.allow_unsupported_sfp=1,1
[ 0.062628] Kernel command line: BOOT_IMAGE=/vmlinuz-6.14.11-4-pve root=ZFS=/ROOT/pve-1 ro root=ZFS=rpool/ROOT/pve-1 boot=zfs quiet intel_iommu=on iommu=pt, quiet ixgbe.allow_unsupported_sfp=1,1
[ 1.067186] ixgbe: Intel(R) 10 Gigabit PCI Express Network Driver
[ 1.067188] ixgbe: Copyright (c) 1999-2016 Intel Corporation.
[ 1.067457] ixgbe 0000:86:00.0: probe with driver ixgbe failed with error -5
[ 1.067784] ixgbe 0000:86:00.1: probe with driver ixgbe failed with error -5
[ 2148.243988] ixgbe: unknown parameter 'allow_unsupported_sft' ignored
[ 2148.244042] ixgbe: Intel(R) 10 Gigabit PCI Express Network Driver
[ 2148.244043] ixgbe: Copyright (c) 1999-2016 Intel Corporation.
[ 2148.244356] ixgbe 0000:86:00.0: probe with driver ixgbe failed with error -5
[ 2148.244500] ixgbe 0000:86:00.1: probe with driver ixgbe failed with error -5
[ 2347.098604] ixgbe: Intel(R) 10 Gigabit PCI Express Network Driver
[ 2347.098608] ixgbe: Copyright (c) 1999-2016 Intel Corporation.
[ 2347.098938] ixgbe 0000:86:00.0: probe with driver ixgbe failed with error -5
[ 2347.099083] ixgbe 0000:86:00.1: probe with driver ixgbe failed with error -5
[ 2521.671657] ixgbe: Intel(R) 10 Gigabit PCI Express Network Driver
[ 2521.671660] ixgbe: Copyright (c) 1999-2016 Intel Corporation.
[ 2521.671983] ixgbe 0000:86:00.0: probe with driver ixgbe failed with error -5
[ 2521.672127] ixgbe 0000:86:00.1: probe with driver ixgbe failed with error -5
root@home:~#
</CODE>




Thanks
 
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