I have simple forwarding issues when running the Debian stable backports kernel (5.9) that I don't see with the stable, non-backported 4.19 kernel. Big fat disclaimer: I compiled my OVS (2.14.1) from source, but given it works with the 4.19 kernel I doubt it has anything to do with it. For good measure, I also compiled 5.10.8 from source and see the same issue I do in 5.9.
The issue I see on 5.x (config snippets below): My VM (vnet0 - 10.10.0.16/24) can ARP/ping for other physical hosts on its subnet (e.g. 00:07:32:4d:2f:71 = 10.10.0.23/24 below), but only the first echo request in a sequence is seen by the destination host. I then have to wait about 10 seconds before pinging the destination host from the VM again, but again only the first echo in a sequence gets a reply. I've tried tcpdump'ing enp0s20f1.102 (the external interface on the hypervisor) and see the pings going out that interface at the rate I would expect. OTOH, when I tcpdump on the destination host, I only see the first of the ICMP echo requests in a sequence (for which an echo reply is sent). I then added an OVS internal port on the hypervisor (i.e., on br-util) and gave it an IP address (10.10.2.1/24). It is able to ping that same external host just fine. Likewise, I am able to ping between the VM and the OVS internal port just fine. When I rollback to 4.19, this weirdness about traffic going out of enp0s20f1.102 *for the VM* goes away and everything just works. Any clues while I start ripping into code? Tyler
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