I have created a number of docker containers and have assigned them static IP's. I can ping them from any other device on the network and they work as expected. I have a mail server running in one of the dockers and would like the unraid server to be able to send email messages to that server.
When I ping the docker from the unraid server I get
From tower.local (192.168.0.31) icmp_seq=1 Destination Host Unreachable
then when I check the arp table i get
mail.local (incomplete) br0
Is there some setting that will allow the docker containers to respond to the unraid server?