Cisco Cisco Web Security Appliance S170 Guía Del Usuario
2-33
AsyncOS 8.6 for Cisco Web Security Appliances User Guide
Chapter 2 Connect, Install, and Configure
DNS Settings
Editing DNS Settings
Step 1
Choose Network > DNS
Step 2
Click Edit Settings.
Step 3
Configure the DNS settings as required.
Step 4
Submit and commit your changes.
Related Topics
•
•
Property
Description
DNS Server(s)
Use these DNS Servers. The local DNS server(s) that the appliance can use to
resolve hostnames.
resolve hostnames.
Use the Internet’s Root DNS Servers. You can choose to use the Internet root
DNS servers for domain name service lookups when the appliance does not have
access to DNS servers on your network.
DNS servers for domain name service lookups when the appliance does not have
access to DNS servers on your network.
Note
Internet Root DNS servers will not resolve local hostnames. If you need
the appliance to resolve local hostnames you must use a local DNS
server or add the appropriate static entries to the local DNS using the
Command Line Interface.
the appliance to resolve local hostnames you must use a local DNS
server or add the appropriate static entries to the local DNS using the
Command Line Interface.
Alternate DNS servers Overrides (Optional). Authoritative DNS servers for
particular domains
particular domains
Routing Table for
DNS Traffic
DNS Traffic
Specifies which interface the DNS service will route traffic through.
IP Address Version
Preference
Preference
When a DNS server provides both an IPv4 and an IPv6 address, AsyncOS uses
this preference to choose the IP address version.
this preference to choose the IP address version.
Note
AsyncOS does not honor the version preference for transparent FTP
requests.
requests.
Wait Before Timing
out Reverse DNS
Lookups
out Reverse DNS
Lookups
The wait time in seconds before timing out non-responsive reverse DNS
lookups.
lookups.
Domain Search List
A DNS domain search list used when a request is sent to a bare hostname (with
no '.' character). The domains specified will each be attempted in turn, in the
order entered, to see if a DNS match for the hostname plus domain can be found.
no '.' character). The domains specified will each be attempted in turn, in the
order entered, to see if a DNS match for the hostname plus domain can be found.