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1

I had a similar (?) challenge on a Red Hat Enterprise Linux box. I read the same paper, and concluded that my real problem was that the default of using every possible IRQ to get every CPU involved in network packet work. I focused the IRQ activity to a subset of available cores and then steered work accordingly. Here's the rc.local file: # Reserve CPU0 ...


2

There are two methods that can be used to handle ARP traffic when NAT is not used. The traffic can be bridged, and the VM will receive and respond to the ARP request on it own. The traffic can be routed, and the VM's host responds with a ProxyARP response. It is also common to us NAT for a VM. In this case the source address (and possibly port) are ...


3

If you're looking for the short answer, it (the router/firewall) already knows all it needs to for the TCP "response" from the session table and routing table. A generic example would look like: If it needs to, the router can run an ARP request same as it would anytime it needs to do a MAC address lookup. But it would typically be for local devices, ...



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