- The IPv4 client comes from the internet and tries to connect to the
firewall's address, which is redirected to the reverse proxy by address
- The IPv6 client comes from the internet through the external firewall
which lets HTTP/IPv6 traffic reach the reverse proxy. There is no translation
here since each host can have its own address.
- The reverse proxy, bound to IPv4 and IPv6 addresses handles the request,
rewrites what needs to be modified and forwards it to the Apache web server
using the IPv4 protocol.