I just wanted to document the fix here since I ran into this problem and couldn't find the fix anywhere. My host and VM were unable to communicate with my modem over 5Gbps, even if I forced negotiation on the modem to no avail. I ran ethtool and discovered the full list of negotiation / speed capabilities were showing: 10/100/1000/2500/5000/10000 (Mbps)
However, the autonegotiation was only advertising 10/100/1000 (Mbps). To fix this I navigated to Proxmox > Shell and executed the following...
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However, the autonegotiation was only advertising 10/100/1000 (Mbps). To fix this I navigated to Proxmox > Shell and executed the following...
Read more