DHCP ranges are set in the Portal.
DNS servers can also be configured. These can be internal (10.X.X.X, 172.16-31.X.X, 192.168.X.X), or external (18.104.22.168, 22.214.171.124, etc)
If a custom DNS address needs set when a site does not have it's own DNS server, such as BobsServer.Bob.com to 192.168.10.50 , please create a support ticket specifying the DNS address and IP. *
If a custom domain is needed internally, such as Bob.com , please create a Support ticket and this will be setup on the Zone(s) needed. *
DHCP TFTP server
A TFTP server can be specified for items such as phones, switches, etc. Please submit a ticket to Support with the Zone and server IP. *
* = A feature request is in to add this to the Portal