Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 455)

Multi-Service IronWare Routing Configuration Guide 427
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Configuring IPv6 Domain Name Server (DNS) resolver
Configuring IPv6 Domain Name Server (DNS) resolver
The Domain Name Server (DNS) resolver feature lets you use a host name to perform Telnet, ping,
and traceroute commands. You can also define a DNS domain on a device to recognize all hosts
within that domain. After you define a domain name, the device automatically appends the
appropriate domain to the host and forwards it to the domain name server.
For example, if the domain “example.com” is defined on a device, and you want to initiate a ping to
host “EXC01” on that domain, you only need to reference the host name instead of the host name
and the domain name. For example, enter either of the following commands to initiate the ping.
Brocade# ping exc01
Brocade# ping exc01.example.com
Defining a DNS entry
You can define up to four DNS servers for each DNS entry. The first entry serves as the primary
default address. If a query to the primary address is not resolved after three attempts, the next
gateway address is queried (up to three times). This process continues for each defined gateway
address until the query is resolved. The order in which the default gateway addresses are polled is
the same as the order in which you enter them.
To define the domain name example.com on a device and then define four possible default DNS
gateway addresses, using IPv4 addressing, enter the following commands.
Brocade(config)# ip dns domain-name example.com
Brocade(config)# ip dns server-address 10.157.22.199 10.96.7.15 10.95.7.25
10.98.7.15
Syntax: [no] ip dns server-address ip-addr [ip-addr] [ip-addr] [ip-addr]
In this example, the first IP address in the command becomes the primary gateway address and all
others are secondary addresses. Because IP address 10.98.7.15 is the last address listed, it is also
the last address consulted to resolve a query.
Defining an IPv6 DNS entry
IPv6 defines new DNS record types to resolve queries for domain names to IPv6 addresses, as well
as IPv6 addresses to domain names. Devices running IPv6 software support AAAA DNS records,
which are defined in RFC 1886.
AAAA DNS records are analogous to the A DNS records used with IPv4. A complete IPv6 address is
stored in each record. AAAA records have a type value of 28.
To establish an IPv6 DNS entry for the device, enter the following command.
Brocade(config)# ipv6 dns domain-name example.com
Syntax: [no] ipv6 dns domain-name domain name
To define an IPv6 DNS server address, enter the following command.
Brocade(config)# ipv6 dns server-address 2001:DB8::1
Syntax: [no] ipv6 dns server-address ipv6-addr [ipv6-addr] [ipv6-addr] [ipv6-addr]