Cisco Cisco Email Security Appliance C160 Références techniques

Clearing all DNS settings and automatically configuring the system to use the 
Internet root servers:

Displaying the current DNS settings.

Each user-specified DNS server requires the following information:

Hostname 

IP address

Domain authoritative for (alternate servers only)

Four subcommands are available within the 

dnsconfig

 command:

dnsconfig roots

dnsconfig print

new

Add a new alternate DNS server to use for specific domains or local 
DNS server.

delete

Remove an alternate server or local DNS server.

edit

Modify an alternate server or local DNS server.

setup

Switch between Internet root DNS servers or local DNS servers.

mail3.example.com> dnsconfig

Currently using the Internet root DNS servers.