Proxicast LAN-Cell 2 User's Guide download pdf (Page 313)

Chapter 14 DNS Screens

LAN-Cell 2 User’s Guide

313

The following table describes the labels in this screen.

14.3 DNS Cache

DNS cache is the temporary storage area where a router stores responses from DNS servers.

When the LAN-Cell receives a positive or negative response for a DNS query, it records the

response in the DNS cache. A positive response means that the LAN-Cell received the IP

address for a domain name that it checked with a DNS server within the five second DNS

timeout period. A negative response means that the LAN-Cell did not receive a response for a

query it sent to a DNS server within the five second DNS timeout period.

When the LAN-Cell receives DNS queries, it compares them against the DNS cache before

querying a DNS server. If the DNS query matches a positive entry, the LAN-Cell responses

with the IP address from the entry. If the DNS query matches a negative entry, the LAN-Cell

replies that the DNS query failed.

14.4 Configure DNS Cache

To configure your LAN-Cell’s DNS caching, click ADVANCED > DNS > Cache. The screen

appears as shown.

Table 115 ADVANCED > DNS > Insert (Name Server Record)

LABEL DESCRIPTION

Domain Zone This field is optional.

A domain zone is a fully qualified domain name without the host. For example,

proxicast.com is the domain zone for the www.proxicast.com fully qualified domain

name. For example, whenever the LAN-Cell receives needs to resolve a

proxicast.com domain name, it can send a query to the recorded name server IP

address.

Leave this field blank if all domain zones are served by the specified DNS server(s).

DNS Server Select the DNS Server(s) from ISP radio button if your ISP dynamically assigns

DNS server information. The fields below display the (read-only) DNS server IP

address(es) that the ISP assigns. N/A displays for any DNS server IP address fields

for which the ISP does not assign an IP address. N/A displays for all of the DNS

server IP address fields if the LAN-Cell has a fixed WAN IP address.

Select Public DNS Server if you have the IP address of a DNS server. The IP

address must be public or a private address on your local LAN. Enter the DNS

server's IP address in the field to the right.

Public DNS Server entries with the IP address set to 0.0.0.0 are not allowed.

Select Private DNS Server if the DNS server has a private IP address and is located

behind a VPN peer. Enter the DNS server's IP address in the field to the right.

With a private DNS server, you must also configure the first DNS server entry for the

LAN, DMZ and/or WLAN in the DNS DHCP screen to use DNS Relay.

You must also configure a VPN rule since the LAN-Cell uses a VPN tunnel when it

relays DNS queries to the private DNS server. The rule must include the LAN IP

address of the LAN-Cell as a local IP address and the IP address of the DNS server

as a remote IP address.

Private DNS Server entries with the IP address set to 0.0.0.0 are not allowed.

Apply Click Apply to save your changes back to the LAN-Cell.

Cancel Click Cancel to exit this screen without saving.

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