The server's real host name tier 1 is different from its vanity name.
The configuration consists of static resolv.conf files and static interface definitions. The proxy IP and port are added to /etc/environment so services that do HTTP/FTP can reach the web. The base file for resolvconf is gets nameservice using the same interface as the proxy since the router provides these services to the host. The /etc/interfaces file has has the static assignments to activate networking.
Application configuration comes next. Postfix is told to receive mail as the vanity domain azcrumpty.dyndns.org while the apt package manager is told to use the proxy. Squid Proxy server is configured to listen on port 80 which is HTTP in plaintext, connect to its peer on tier 2, and ensure ACLs are permissible.