October 8, 2025Oct 8 I am currently using an Intel dual port 10-Gigabit X540-AT2 NIC in my server. I installed this yesterday and everything worked fine with the card setup as a bond linked to a Ubiquiti UniFi USW Flex XG 10Gb with 2 ports aggregated to account for the NIC bonding.This morning, I was not able to login to the server and resolved this by unplugging the ethernet cables and then plugging them back in. This restored the connection and I was able to login. I checked the logs and there were some entries in there but I cannot make any heads or tails about this. I have now reconfigured the bond into 2 separate ports along with removing the aggregated port config on the switch the server is connected to.I have attached the log - if anyone has some insight in what happened that would be awesome - I will see if the issue occurs with a non-bonded connection.syslog.txt Edited October 8, 2025Oct 8 by thaoggamer SET TO SOLVED
October 8, 2025Oct 8 Community Expert Solution As usual. bonding does not really help, as you can see.But here it maybe that you have selected the wrong bonding mode. Seems that you have picked "active backup", but your switch wants something else (Static LAG configurations are not supported, only LACP (802.3ad).So the two do not really talk to each other.You may either try this mode, or leave the single port version (it is VERY unlikely that you will see a speed increase with the LACP. You need a lot of parallel clients to get benefits. Each single connection will still use only one card)
October 8, 2025Oct 8 Author Thanks @MAM59 I will give it a go... the only thing I don't understand is that with my previous 2.5Gb card I had it set to active/backup and I never had issues with the connection dropping... weird... but will see how it goes.
October 8, 2025Oct 8 Community Expert There maybe another problem with the cables. If the line keeps on dropping often, check them (and replace them for better ones).Maybe they were good enough for 2,5G (which uses a lot of pauses to cool down the cable) but do not survive the stress of real 10G (2,5G is just "10G with 3 pauses")So you never noticed that the 2,5G bond was wrong too, it simply never dropped off.
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