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Thursday, February 29, 2024

community – Tagged VLAN site visitors goes just one approach between mac and Linux

I used to have a Mac Mini 2018 with 10Gpbs ethernet related to my 10Gbps change. I had a tagged vlan to entry my NAS. It labored very nicely final time I checked. I do not bear in mind after I really checked it final time, however not less than every part – time machine, shared mounts, and so forth – gave the impression to be working high-quality) till I changed it with a Mac Studio in april.

Then I spotted one thing bizarre: site visitors between Mac Studio and different macs on my community – 10Gbps or not – flows very nicely on tagged vlans. Nonetheless, site visitors between my Mac Studio and my NAS (after which between my Mac Studio and different Linux machines) goes just one approach – Mac -> Linux, when utilizing a tagged vlan. I get no site visitors from the linux machines again to the mac. Linux <–> Linux works nicely, Mac <–> Mac works nicely.

I believed initially this was a Mac Studio challenge. So I examined with a MacBook Professional M1. Identical drawback. I believed, oh nicely, this is perhaps an M1 challenge. I borrowed a MacBook Professional 2018, and once more, similar challenge.

I used iperf3 for testing. I modified the switches – my community has principally Ubiquiti switches, however I even have a small Mikrotik, and I examined with it. I even examined site visitors between a mac and a Linux VM on ESXi operating on a Mac Mini 2014. Nonetheless the identical challenge: site visitors goes just one approach between macOS and non-macOS. I additionally tried completely different Linux distros (Fedora, Ubuntu, TrueNAS Scale).

I’m inclined to consider it is a Monterey challenge, however my earlier Mac Mini did have Monterey (though it was nonetheless one of many first variations).

The one factor I have not examined is site visitors to a linux machine that’s not on a VM. All my assessments have been between a mac and a Linux hosted on a VM beneath ESXi. However nonetheless, site visitors between Linux on completely different hosts/machines/esxi-nodes labored high-quality.

Site visitors that goes on untagged vlan flows usually.

Any clue on methods to debug this correctly to get the wrongdoer?

EDIT: simply to make clear, I do not consider it’s an MTU challenge. I had jumbo frames enabled all the way in which (the Mac Studio had completely the identical configuration as my earlier Mac Mini, which had its MTU adjusted to 9000). And, as stated, it does work between two macs and to Linux machines. I additionally tried with the usual MTU (1500), adjusting all of it alongside the way in which, and similar conduct.

EDIT #2: I handle to check site visitors between the Mac and a Linux (Fedora) on naked steel, once more, on tagged vlan. It labored. So possibly ESXi is the issue.

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