3Com OfficeConnect 3CP4144, Руководство пользователя CLI

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6-14 C
HAPTER
6: M
ANUAL
S
ETUP
Configuring DNS
■
To enable DNS functionality on the OfficeConnect Remote 812, use the
command:
enable dns
■
To disable DNS functionality, use the command:
disable dns
You can configure three global DNS parameters that control the operation of the
DNS proxy.
■
Number of Retries : the number of retry attempts when accessing a primary or
secondary DNS server. The default is 1 retry.
■
Timeout : the amount of time to wait for request to be serviced. The default is 5
seconds.
■
Cache size : the number resolved names to cache. The default is 100 entries.
■
You can view the current DNS settings with the command:
show dns settings
■
You can alter the current DNS settings with the command:
set dns
cache_size <size>
number_retries <number>
timeout <seconds>
DNS Host Entries
■
To add a DNS Host entry to the DNS Static Host table, use the command:
add dns host <host name> address <ip address>
■
To view the contents of the Static Host table, use the command:
list dns hosts
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To delete a specific Host entry, use the command:
delete dns host <host name>
Managing the DNS
Proxy
When resolving a DNS name, the OfficeConnect Remote 812 first searches for a
match in the Static Host table. If a match is not found it will perform a proxy
function. The DNS Server table contains a list of DNS Servers for specific domains.
Each domain listed in the table can have up to two DNS Server addresses
associated with it. The default domain has the name ‘*’.
Using PPP it is possible to learn DNS server addresses when the PPP session is
established. In addition to specifying server addresses in the DNS Server table, you
can specify a VC profile name that should be used to learn the addresses.
■
To create a DNS Server entry when specific addresses are known, use the
command: