what can you do when you have no dns in your router

atleast you have the dhcp you can configure.
you can redirect all your vm using ssh to another fixed ip.
you can set the hostname in individual linux vm (fact(n) timne)
you can use some script with ip (symmetric conf with the router)

i fixed the highspeedsandwitch vm to 192.168.1.104
i can use madafaka for hss engine test. then use hss for production