SOLVED Recent Upgrade to TrueNAS- Network adapter reduced to 100BaseTX

[endnot]

My mainboard is a Supermicro 10slm with 2 Gigabit network connections enabled (igb0 and igb1). While troubleshooting communication with the NAS was slow, I noticed that igb0 reported being 100baseT, which, in turn, explained why iperf reported only getting 96Mbit/s transfer rate. I don't know why this adapter is stuck at 100Mb/s. I was able to swapped the ip address to the other adapter and throughput is now reported at 940Mb/s.

I wonder if this is a coincidence, or something related to the TrueNAS12 update that affected the settings for the igb0 networking adapter. Is there a s/w setting that can change the speed of the adapter or is this adapter just failing? TIA.

 

[jgreco]

Check your cabling. Falling back to 100Mbps is a frequent failure mode of a bad cable, because 100Mbps only requires 2 pair but 1000Mbps requires all four.

Ethernet autoconfiguration is standard in gigabit ethernet, so there is no need to try to force settings that don't really want to be forcibly set. This is much nicer than the days of 100Mbps when you often did need to force settings. :-/

 

[ChrisRJ]

This is much nicer than the days of 100Mbps when you often did need to force settings. :-/

Or the 10Base2 days, when the physical layer was a bus topology. I once had a terminator with intermittent issues and it took almost a week to find it.

 

[jgreco]

Much more entertaining were the 10base5 days where someone would screw up the vamp.

 

[endnot]

Solved- Thanks for your responses. The problem was with a pi-hole setup.
I had created a VM running pi-hole, that I did not take account for while messing with the network interfaces. I thought the pi-hole was doing DNS and DCHP for me - which is another story altogether. For a couple of hours last night, I had my entire network hosed up and off line. I was not able to restore it until I took TrueNAS off-line. After restoring the network interfaces all is back as it should have been before I got involved...
Timing wise, I was playing with this VM when I upgraded to TrueNAS-12 - the coincidence. Between IPv6, IPv4, wired, and wireless networks you can screw up a lot and still have it somewhat function. The pi-hole is still running but my router is doing DCHP. I am not exactly sure what is doing my DNS lookups but it doesn't appear that any ads are being blocked...

I did learn how to use iperf.