Extreme Networks routers use DNS services in their subnetwork
configurations (see Configure Subnetwork Space Advanced Settings). When the network type is
for internal or guest use, an Extreme Networks router applies this
service to the DNS requests from clients connecting to the router either directly or
through an intermediary AP or switch. When the network type is management, the
router applies this to DNS requests from APs and switches on the same management
network behind the router, and to the mgt0 interface of the router itself.
Use this task to add or edit a DNS service for use at the network policy level, or at
the device level for routers and VPN Gateway Virtual Appliances.
-
Go to .
-
Select an existing DNS Service object, and then select
, or select 
.
-
Type a
Name.
- Optional:
Type a
Description.
Although optional, descriptions can be helpful when you
are troubleshooting your network.
-
Select Enable DNS Snooping for static DNS clients to
enable access data collection.
-
With DHCP enabled, if you select Supply external DNS server IP
addresses in DHCP offers, enter the static IP address of at
least one external DNS server.
-
If you select Set the router as the DNS
server in DHCP offers, configure the following settings:
- Set the router to use
the same DNS servers for all domain name lookups: This
is non-split mode. With this option, the router sends DNS requests for
names that match domains to the DNS servers you specify. Specify
external domain name lookups:
- Resolve
client name requests using the same DNS servers as
configured for the router: With this option, the
router sends all requests to the DNS servers it learns through
DHCP.
- Specify name
servers: Enter the static IP address of at least
one DNS name server to resolve all domain name lookups.
- Set the router to use
separate DNS servers for internal and external domain name
lookups: This is split mode. You must specify at least
one DNS server, which can be accessed through either a VPN tunnel or on
the Internet. The router sends DNS requests for names that match
internal domains to the specified internal DNS servers, and sends other
requests through DHCP to specified external DNS servers. For internal
and external domain name lookups:
- Enter the
internal domain names that the internal DNS servers will use for
comparison and name resolution. Enter each domain name on a
separate line. Enter the static IP address of at least one
internal DNS server.
- Under Domain Name
Specific Settings, to restrict a domain name to
a single DNS server for security purposes, select the plus sign,
enter the domain name and DNS server IP address, and select
ADD.
- Resolve
client name requests using the same DNS servers as
configured for the router: With this option, the
router sends all requests to the DNS servers it learns through
DHCP.
- Specify name
servers: Enter the static IP address of at least
one DNS name server to resolve all domain name lookups.
-
Select SAVE.
