3Com OfficeConnect Remote 812 enable dns, show dns settings, set dns, cachesize size, number

6-30CHAPTER 6: MANUAL SETUP

Configuring DNS To enable DNS functionality on the OCR 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
		To delete a specific Host entry, use the command:
		delete dns host <host name>
Managing the DNS	When resolving a DNS name, the OCR 812 first searches for a match in the Static
Proxy	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:

add dns server <domain name> primary_address <ip address> secondary_address <ip address>

To create an entry that will learn addresses using PPP, use the command: add dns server <domain name> vc <vc name>