Руководство Пользователя для Cisco Cisco Web Security Appliance S170
Chapter 25 Configuring Network Settings
Configuring DNS Server(s)
25-28
Cisco IronPort AsyncOS 7.1 for Web User Guide
OL-23207-01
Configuring DNS Server(s)
You can configure the DNS settings for your IronPort appliance using the
Network > DNS page or 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.
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.
DNS server, either Data or Management.
•
The number of seconds to wait before timing out a reverse DNS lookup.
•
Clearing the DNS cache.
Specifying DNS Servers
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.
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.
Split DNS
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.
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”.