User`s guide

®
USER’S GUIDE AUTOMATIC TRANSFER SWITCH
60
DNS servers
The Network Management Card cannot send any e-mail unless the IP
address of the primary DNS server is defined.
The Network Management Card will wait a maximum of 15 seconds for a
response from the primary or (if specified) the secondary DNS servers. If
the Network Management Card does not receive a response within that
time, e-mail cannot be sent. Therefore, use DNS servers that are on the
same segment as the Network Management Card or on a nearby segment
(but not across a wide-area network (WAN)).
Once you define the IP addresses of the DNS servers, verify that DNS is
working correctly by entering the DNS name of a computer on your network
to test whether you can look up the IP address for that computer.
See DNS.