Brocade Virtual ADX Global Server Load Balancing Guide (Supporting ADX v03.1.00) - Manual (Page 85)

Brocade Virtual ADX Global Server Load Balancing Guide 75
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Transparent DNS query intercept
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Syntax: host-info host-name ip-list { ipv4-address | ipv6-address }
This command specifies the IPv4 or IPv6 addresses you want the Brocade Virtual ADX to use in its
replies to the intercepted DNS queries. You can specify as many addresses as you need. Separate
each address with a space.
The Brocade Virtual ADX applies the GSLB policy to the addresses and sends only the best address
in the response to a client query. If the GSLB policy does not result in a best address to send to the
client, the Brocade Virtual ADX forwards the request to the authoritative DNS server. In either case,
the source IP address in the response is the DNS server IP address, so the client always receives a
response that appears to be from the DNS server.
Syntax: dns transparent-intercept
This command enables the DNS transparent intercept feature. You need to use this command only
when you are configuring the type of transparent DNS query intercept that responds directly to the
client. If you are configuring the type of transparent DNS query intercept that redirects the query to
an alternative DNS server or to another ADX device, do not use this command.
For information about the other commands, refer to “Redirecting queries” on page 71.
Displaying transparent DNS query intercept statistics
To display transparent DNS query intercept statistics, enter the following command at any level of
the CLI.
Syntax: show gslb global-stat
The transparent DNS query intercept statistics are displayed in the DNS query intercept stat
section.
For information about the statistics in the DNS cache proxy stat section, refer to “Displaying DNS
cache proxy statistics” on page 66.
TABLE 4 Transparent DNS query intercept statistics
Field Description
Redirect The number of queries the Brocade Virtual ADX has redirected to an
alternative (proxy) DNS server or another ADX device.
Direct response The number of queries to which the Brocade Virtual ADX has directly
responded using an IP address configured for the domain.
Virtual ADX>show gslb global-stat
DNS proxy statistics:
TCP response = 0 UDP response = 0
Query type A = 0 Query type ANY = 0
DNSSEC response = 0
DNS cache proxy stat:
Direct response = 0 Query type ANY = 0
Query type A = 0 Query type AAAA = 0
DNS query intercept stat:
Redirect = 0 Direct response = 0
Unsupported query types stat:
Error handling cnt = 0