I cannot get the network interface “up” on the Ethernet port of my DGX Spark computer. I confirmed the CAT6 cable and the switch port (by another DGX Spark computer), tested with point to point connections on both units, but the interface never becomes active on enP7s7.

nvidia-bug-report.log.gz (774.5 KB) Please see attached.

Thank you for the info. Can you also run sudo ethtool enP7s7? This will tell us if the link is active. If you see Link detected: no, try running sudo ip link set enP7s7 up and checking again with ethtool

Thank you. I executed the commands, please see below. fabric@spark-7c26:~$ sudo ethtool enP7s7 [sudo] password for fabric: Settings for enP7s7: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full 10000baseT/Full 2500baseT/Full 5000baseT/Full Supported pause frame use: Symmetric Receive-only Supports auto-negotiation: Yes Supported FEC modes: Not reported Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full 10000baseT/Full 2500baseT/Full 5000baseT/Full Advertised pause frame use: No Advertised auto-negotiation: Yes Advertised FEC modes: Not reported Speed: Unknown! Duplex: Unknown! (255) Auto-negotiation: on Port: Twisted Pair PHYAD: 0 Transceiver: internal MDI-X: Unknown Supports Wake-on: pumbg Wake-on: g Current message level: 0x00000033 (51) drv probe ifdown ifup Link detected: no fabric@spark-7c26:~$ fabric@spark-7c26:~$ sudo ip link set enP7s7 up fabric@spark-7c26:~$ fabric@spark-7c26:~$ ip link show dev enP7s7 2: enP7s7: mtu 1500 qdisc mq state DOWN mode DEFAULT group default qlen 1000 link/ether 4c:bb:47:2f:7c:26 brd ff:ff:ff:ff:ff:ff altname enP7p1s0 fabric@spark-7c26:~$ fabric@spark-7c26:~$ sudo ethtool enP7s7 Settings for enP7s7: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full 10000baseT/Full 2500baseT/Full 5000baseT/Full Supported pause frame use: Symmetric Receive-only Supports auto-negotiation: Yes Supported FEC modes: Not reported Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full 10000baseT/Full 2500baseT/Full 5000baseT/Full Advertised pause frame use: No Advertised auto-negotiation: Yes Advertised FEC modes: Not reported Speed: Unknown! Duplex: Unknown! (255) Auto-negotiation: on Port: Twisted Pair PHYAD: 0 Transceiver: internal MDI-X: Unknown Supports Wake-on: pumbg Wake-on: g Current message level: 0x00000033 (51) drv probe ifdown ifup Link detected: no fabric@spark-7c26:~$

@aniculescu I posted the outputs from ethtool yesteday. I wanted to ask if you have any feedback about them.

I’m not sure if your issue is a bug. If you turn off and turn on your DGX without rebooting, see if the Ethernet port works. There is a known bug where the system might mix up the NIC model after a reboot.

The bug report and ethtool output indicate that the interface never establishes a physical link. ethtool shows: Speed: Unknown! Duplex: Unknown! (255) Link detected: no The interface is up but remains in NO-CARRIER with auto-negotiation enabled, which means no link signal is being detected. From the driver side: r8127 0007:01:00.0: invalid VPD tag 0x00 (size 0) at offset 0; assume missing optional EEPROM This indicates missing optional VPD data but does not directly explain link failure. Interrupt activity provides an additional signal: All 17 MSI-X vectors for enP7s7 show zero counts The driver initialized and allocated resources, but the device never generated interrupts, consistent with a link that never came up. MDI-X state is also reported as Unknown, so auto-crossover did not resolve a connection. With the cable confirmed working on another system, the issue appears localized to this unit. At this point, the logs show that: the driver loads successfully the interface is created but no physical link is ever established Further determination (software vs hardware path) would require vendor-level validation.

Thanks for the logs. To confirm, you said you only see this happening on one Spark? Have you tried connecting the Ethernet ports of two Sparks directly together with no switch?

I have just recieved a spark today, it did the out-of-box update over the ethernet port (from the setup process in the manual) and then rebooted and the ethernet port hasnt worked since. Neither the onboard RJ45 or a USB-RJ45 dongle that network manager recognises seem to acknowledge that there is a carrier present anymore. Hate to be “that guy”, but seems I have this issue. I’ve swapped cables to known working ones, and the OOB experience worked fine but this is a problem.

[image] aniculescu: Have you tried connecting the Ethernet ports of two Sparks directly together with no switch? Yes, I connected the Ethernet ports of the two Sparks directly together with no switch in between, and still there is no link.

Ethernet port on DGX Spark is not working

Accelerated Computing DGX Spark / GB10 User Forum DGX Spark / GB10

takashii April 11, 2026, 10:32am 8

You may check this ( Realtek r8127 Ethernet NIC disappears on every reboot, only recovers with full power cycle ) if you encounter the bug

Topic		Replies	Views
Ethernet connection fails randomly DGX Spark / GB10	8	584	May 19, 2026
Ethernet Connection to DGX spark is unstable DGX Spark / GB10	1	510	January 19, 2026
DGX Spark: Ethernet connection unstable after November 2025 update – EEE (Energy Efficient Ethernet) workaround DGX Spark / GB10 ota	17	1683	January 31, 2026
Defective onboard RTL8127 NIC on DGX Spark DGX Spark / GB10 ota , dgx-spark-issue	4	488	October 7, 2026
Unable to setup DGX Spark DGX Spark / GB10 spark	1	423	March 4, 2026
DGX Spark network issue DGX Spark / GB10	1	284	January 21, 2026
DGX Spark Networking Issue DGX Spark / GB10	15	2619	November 27, 2025
WiFi, Ethernet not working on initial boot setup DGX Spark / GB10 boot , kernel	6	1616	December 8, 2025
Failing RTL8127" on DGX Spark NIC Network Management Products	2	379	May 28, 2026
Dual DGX Spark Network issue DGX Spark / GB10 networking , spark , dgx , dgx-spark-issue	6	632	June 1, 2026

Ethernet port on DGX Spark is not working

Related topics