Intel 7190 manual NSLookup, Configure DNS Servers, Multiple-VIP Response

C H A P T E R 3 Intel® NetStructure™ 7190 Multi-Site Traffic Director User Guide

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

NOTE: If the 7190 was not configured with a primary name server during setup from the Boot Monitor, the nslookup command fails.

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.

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 met2. 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.

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