Dns - Nortel Enterprise Edge 2.0 Programming Manual

DNS

Enterprise Edge functions as both a gateway to the Internet and as a DNS proxy.
Note: If your PC is a DHCP client under Enterprise Edge, you do not have to let
your workstations know that Enterprise Edge is your Internet gateway.
When Enterprise Edge receives DNS requests from clients, it first checks its local
cache for name entries and records. If found locally, Enterprise Edge immediately
responds to clients. Otherwise, Enterprise Edge creates a new DNS request to the
remote Primary or Secondary DNS servers on behalf of the client. If the remote
DNS server responds with the requested records, they are forwarded to clients and
cached in Enterprise Edge.
Guidelines for Using Enterprise Edge DNS service
Consider the following guidelines when using DNS:
• If you enable the Enterprise Edge DNS service, make sure that you configure
each workstation on the network to use Enterprise Edge as DNS server.
• When you disable Enterprise Edge DNS service, set the DNS Server field in
DHCP configuration to the remote DNS server IP address. If DHCP service is
also disabled in Enterprise Edge, you must configure each workstation on your
network to use the remote DNS server
1. To configure DNS services settings, select Services, and click on the DNS
heading in the navigation tree.
The DNS Summary screen appears.
2. Configure the DNS Summary attributes as per the table below:
Attribute
Description
Version
Status
Domain
Primary (and
Secondary)
Server
Forward Timeout Allows you to specify the time-out, in seconds, to resolve queries using the
3. Press the Tab key to save the settings.
Note: The DNS proxy carries security features because it keeps all of the internal
IP addresses from external web servers. For information on other security
features, see
Firewall Filters
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Description
Allows you to view the description of the server in cache mode.
Allows you to view the version of the software interface.
Allows you to enable or disable the DNS cache proxy in Enterprise Edge.
Allows you to specify the domain name that Enterprise Edge and its DHCP
clients uses. When you modify the Domain, the setting automatically copies to
Domain Name global options under DHCP service.
Allows you to specify the primary server IP address in a valid dot format. You
can specify more than one address if you separate them by a space. DNS cache
uses them in the order you specify, to resolve names.
DNS servers that you specify in DNS server.
NAT (Network Address Translation)
on page 235.
Enterprise Edge 2.0 Programming Operations Guide
Configuring Enterprise Edge Services 199
on page 232 and IP