Cisco Cisco Web Security Appliance S690 User Guide

You can configure the DNS settings for your IronPort appliance using the 
Network > DNS page or using the 

dnsconfig

 command. Before you configure 

DNS, consider the following:

Whether to use the Internet’s DNS servers or your own, and which specific 
server(s) to use.

Which routing table to use for DNS traffic. 

You must use the routing table associated with the interface that faces the 
DNS server, either Data or Management. 

The number of seconds to wait before timing out a reverse DNS lookup.

Clearing the DNS cache.

IronPort AsyncOS can use the Internet root DNS servers or your own DNS 
servers. When using the Internet root servers, you can specify alternate servers to 
use for specific domains. Since an alternate DNS server applies to a single 
domain, it must be authoritative (provide definitive DNS records) for that domain. 

AsyncOS supports split DNS where internal servers are configured for specific 
domains and external or root DNS servers are configured for other domains. If you 
are using your own internal server, you can also specify exception domains and 
associated DNS servers.

- NEW - Add a new host.

[]> new

Please enter the hostname of your relay host. You may put a colon 

after the hostname to indicate a port to use other than 25, such as 

“smtp.example.com:547”.