Cisco Cisco Email Security Appliance C190 ユーザーガイド

Click Next to continue.

In Step 3, you define the default router (gateway) and configure the DNS settings, and then set up the 
appliance to receive and or relay email by configuring the Data 1, Data 2, and Management interfaces.

Type the IP address of the default router (gateway) on your network. You can use an IPv4 address, an 
IPv6 address, or both.

Next, configure the DNS (Domain Name Service) settings. Cisco IronPort AsyncOS contains a 
high-performance internal DNS resolver/cache that can query the Internet’s root servers directly, or the 
system can use DNS servers you specify. If you choose to use your own servers, you will need to supply 
the IP address and hostname of each DNS server. You can enter up to four DNS servers via the System 
Setup Wizard. Please note that DNS servers you enter will have an initial priority of 0. For more 
information, see 

The appliance requires access to a working DNS server in order to perform DNS lookups for incoming 
connections. If you cannot specify a working DNS server that is reachable by the appliance while you 
are setting up the appliance, a workaround is to either select “Use Internet Root DNS Servers” or to 
specify, temporarily, the IP address of the Management interface so that you can complete the System 
Setup Wizard.

Your Cisco IronPort appliance has network interfaces that are associated with the physical ports on the 
machine. For example, on C650/660/670, C350/360/370, and X1050/1060/1070 appliances, three 
physical Ethernet interfaces are available. On C150/160 appliances, two physical Ethernet interfaces are 
available.