Does the mere existence of a DNAT rule cause the system to respond to
ARP requests for the translated IP address?

When I originally set up the system I assumed I had to add additional IP
addresses to the external interface for each of my DNAT rules, but
reading random docs I suddenly thought maybe I needn't have - I can't
now see anything that tells me I had to. A quick experiment on my home
system was inconclusive - probably a bug in my rules.

(I've long suspected that the 16 extra IP addresses on my external NIC
is what is causing slow network initialisation and hence failure of sshd
and apache to bind to their ports on boot.)

Regards - Philip

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