How can I make DNAT host respond to ARP requests?

I have a ubuntu server host with nftables set up to NAT incoming ssh connections on a group of IP addresses and ports to certain other IP addresses and ports connected on certain other interfaces. See illustration. I initially only configured 192.168.1.10 on eth0. This seems to work, packages to 192.168.1.11-13 on the configured NAT source ports are really forwarded as intended. However, occasionally it stops working and the ssh clients get error message no route to host . I figured out it has to do with arp: when some client on my 192.168.1.0 subnet wants to connect with ssh to 192.168.1.12 i

Question by Oskar Enoksson on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.