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My scenario was a bit complicated ( https://forum.proxmox.com/threads/bonded-vlan-dhcp-guest-networking-example.50699/ ), but I found the dnsmasq program's DHCP running on the same server as Proxmox to be effective. Maybe people could come up with example configurations for other scenarios.

I've seen this in VMware hosted on Netapp when there are network blips. It's a general Linux thing, probably "errors=remount-ro" related.

I had a lot of trouble doing this, but it all seems to be working now, so I'd like to share for the next someone doing a search. Scenario: corporate environment with a single standalone Proxmox VE (5.3) instance. The host has dual interfaces, which need to be bonded, and there's a dedicated...

That looks workable, but somewhat tedious, since Proxmox doesn't seem to want to hand out a bunch of consecutive MAC addresses. Or is there a way to do that? (Or even just have Proxmox assign from a pool of fixed MAC addresses which I can use to generate my DHCP config.)

Well, replacing (=rebuild on new machine) he DHCP server seems to have fixed this. I don't know why there are tap devices in there, like I said, I got tasked with fixing this after everyone who knew anything about it left. (And left no documentation.)

Okay, I configured one of the nodes to have a static IP, but I'm not getting anything still. The tap device for that node still shows no IP: tap152i0 Link encap:Ethernet HWaddr a6:a7:9c:41:7f:c4 inet6 addr: fe80::a4a7:9cff:fe41:7fc4/64 Scope:Link UP BROADCAST RUNNING...

AKA "fix it on the node"? I hadn't tried that. Nodes are all Windows anyway, so no /etc/network/anything there.

For experimenting here, how do I configure nodes to be staticly IPed instead of using DHCP?

I can ping gateway + world from the host system. I can ping nothing from the guest nodes.

No one has any ideas what to check for next?

For fun, I tried a tcpdump on one of the tap interfaces 17:40:53.696914 ARP, Request who-has 10.20.20.108 tell 10.20.20.10, length 46 17:40:53.719117 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from 3e:cf:8c:0a:6b:4d (oui Unknown), length 300 17:40:53.819455 IP...

The server here is in a remote data center. I can ssh in, and from there networking seems fine. But none of the guest machines on the server can reach anything when they all worked at last test, a couple of weeks ago. I had nothing to do with configuring this machine to start with, and I'm not...