DNS enables EZproxy to act as a DNS server capable of responding to its own name and the name of any hostname in use by Proxy by Hostname. This feature can be used in place of a wildcard DNS entry to enable proxy by hostname.
To enable this feature, your DNS administrator must delegate control of the zone that matches your EZproxy server to your EZproxy server.
In the BIND name server, the entries would look similar to:
ezproxy.yourlib.org. IN A 184.108.40.206 ezproxy.yourlib.org. IN NS ezproxy.yourlib.org.
The A (address) entry allows the name of your EZproxy server to be resolved by your main DNS server, and also acts as the glue records required for the NS (name server) entry. The NS (name server) entry tells remote DNS servers that requests for names that are or end with ezproxy.yourlib.org should be directed to your EZproxy server.
In Windows DNS, use these steps would be used to establish the ezproxy.yourlib.org entry:
A basic example of DNS is:
On the EZproxy server, you must make an entry like this in config.txt:
If you are running EZproxy on Linux or Solaris, you must start EZproxy as root for this line to be valid.
This example is the simplest case. The IP address you supply must be that is valid on your EZproxy server.
If you use Network Address Translation and have separate addresses for internal and external DNS, you might need a more complex entry like this:
This example tells EZproxy to listen on IP address 10.125.200.14. In general, it is to respond that the IP address of your EZproxy server is 220.127.116.11, but the second line indicates that EZproxy should provide its own internal address of 10.125.200.14 whenever the request comes from an internal address that starts with 10.
By default, EZproxy will only respond to hostnames that it is using. If you are running multiple copies of EZproxy on a single server, you may need to have EZproxy respond to any possible hostname to allow names used by other instances to be considered valid. To handle this case, add this line to config.txt:
This will allow any DNS hostname that end in the name of the EZproxy server to be considered valid. In this configuration, only one copy of EZproxy will have the DNS line. In this scenario, you might choose to have a single copy of EZproxy that does nothing but handle DNS.