...
[root@c-csn2 nodeconfigs]# cat sn000c290ac7a2.cfg
ipaddress = 192.168.202.84 192.168.202.85 192.168.202.86
gateway = 192.168.202.3
netmask = 255.255.255.0
processes = 3
There is a a script in in the support bundle swarm-support-tools.tgzcalled csn-create-nodeconfigs.sh that will allow you to create the appropriate files assuming your current ip-assignments output is the desired MAC to IP binding.
...