LAN interface Speed and Duplex not correct working
-
Hi, i never have this problem before with 24.03. The problem exist, if set to auto select option interface on LAN. Then card speed and duplex going 10 Mb or 100 simply start jumping and losing internet connection. Very interesting, another cards on same box working correctly with auto select option. If set to default Speed and Duplex card start working. All cards are intel i226-v, any ideas?
-
The igc driver does not actually support fix speeds or duplex settings in any version. When you set that what it does is restrict the advertised speeds that it can negotiate in auto-select.
So it can never link to a NIC that is not auto-negotiating (true fixed speed/duplex).
Additionally it has a quirk where setting it to auto-select specifically rather than default can cause the link to flap at ~2s intervals in my experience.
i225/i226 NICs using the igc driver should always be left at default unless you have a very good reason to set anything else. However that isn't a regression. The behaviour was the same in 24.03.
Steve
-
@stephenw10 Oh, so better to keep "default (no preference, typically autoselect)" option with this NIC's and not to set to autoselect?
-
Yes. In almost every case when using igc.
