Deployment Guide

4.3.3 DNS redirector based configuration
The Eyes can obtain their Carat server connection information from a specially configured DNS server,
called a DNS redirector service.
DNS redirector service can be hosted by the Carat server itself, or any other (Linux) host accessible for
Eye monitoring stations.
The DNS redirector service has a record for each Eye. The record contains the IP address of the Carat
server as an A record, and port numbers and organization name as TXT records.
If an Eye has been configured to get Carat connection information from DNS redirector service, it will send
a DNS query targeted to the DNS redirector service. The queried is formed as follows:
Eye-<MAC address separated by dashes>  .eye.7signal.com
The DNS redirector server configuration has an entry for Eye:
● A record contains the IP address of the Carat server
● Three TXT records contain port number, default port number and organization information.
DNS redirector server configuration
The following instructions apply to ISC bind DNS server
1. Install bind package by using yum in a Linux system which will be hosting DNS redirector service.
2. Edit configuration file /etc/named.conf. The most important parts are:
a. DNS server listen address
b. Zone information block
Zone information defines e.g. the DNS suffix from which the Eyes will search the Carat connection
information:
7signal Solutions Inc., 6155 Rockside Road, Suite 110, Independence, Ohio 44131, USA,
216-777-2900, [e-mail], www.7signal.com