Use Case 3: Firewall Acts as DNS Proxy Between Client and
In this use case, the firewall is located
between a DNS client and a DNS server. A DNS Proxy on the firewall
is configured to act as the DNS server for the hosts that reside
on the tenant’s network connected to the firewall interface. In
such a scenario, the firewall performs DNS resolution on its dataplane.
This scenario happens
to use split DNS, a configuration where DNS Proxy rules
are configured to redirect DNS requests to a set of DNS servers
based on a domain name match. If there is no match, the server profile
determines the DNS servers to which to send the request, hence the
two, split DNS resolution methods.
For dataplane DNS
resolutions, the source IP address from the DNS proxy in PAN-OS
to the outside DNS server would be the address of the proxy (the
destination IP of the original request). Any service routes defined
in the DNS Server Profile are not used. For example, if the request
is from host 172.16.1.1 to the DNS proxy at 192.168.1.1, then the
request to the DNS server (at 10.10.10.10) would use a source of
192.168.1.1 and a destination of 10.10.10.10.
and enter a
the DNS Proxy.
, select the virtual
system of the tenant, in this example, Corp1 Corporation (vsys6).
, select the interface
that will receive the DNS requests from the tenant’s hosts, in this
Choose or create a
customize DNS servers to resolve DNS requests for this tenant.
DNS Proxy Rules
Turn on caching
of domains resolved by this mapping