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C H A P T E R 3 Intel® NetStructure™ 7190 Multi-Site Traffic Director User Guide
22
NSLookup
The nslookup utility can verify that the 7190 is correctly resolving
www.somedomain.xyz-ex.com:
Intel 7190# nslookup
www.somedomain.xyz-ex.com
Server: server1.xyz-ex.com
Address: 192.168.16.4
Name: www.somedomain.xyz-ex.com
Address: 192.168.16.23
Configure
DNS Servers
The existing DNS server or servers must be correctly configured to
work with the 7190s. Entries need to be made that delegate the
responsibility of resolving DNS queries for www.xyz-ex.com to the
7190s. This can be done in one of two ways. The first way is to
delegate the entire zone to the 7190. This works fine as long as only
type A records need to be returned for this zone. The 7190 is a high
performance specialized DNS server and supports only the more
common type A records.
NOTE: If the 7190 was
not configured with a
primary name server
during setup from the
Boot Monitor, the
nslookup command fails.
The recommended way of configuring your existing DNS server is
delegate partial authority by aliasing. All of the 7190s (both primary
and all secondaries) must be included in the authority record (NS)
portion of the delegation.
Multiple-VIP Response
A DNS response may contain multiple answers. A standby VIP is
automatically considered as a response if it is marked “IN USE” due
to a failed VIP. When multi-VIP standby is enabled, standby VIPs are
included in a response if the number of additional VIPs in the
response has not been met
2
. To include standby VIPs, type config
dns zones <zonename> hostnames <hostname> multi-vip-
standby enable.
7190#config dns zones somedomain.xyz-ex.com
hostnames www multi-vip-standby enable
2.
If multi-VIP standby is enabled when using the Flash load balancing method,
standby VIPs from a site are not included if all of the VIPS are (1) standby and,
(2) not marked “IN USE” due to a failed VIP at another site.