Cisco Cisco Email Security Appliance C160 Mode D'Emploi

IP address connecting to a specific listener. Two connections from the same IP address to different 
listeners results in 2 rows in the table. 

 describes the fields displayed when using the 

topin

 

command.

The system does a reverse DNS lookup to find the remote hostname, and then a forward DNS lookup to 
validate the name. If the forward lookup does not result in the original IP address, or if the reverse DNS 
lookup fails, the table displays the IP address in the hostname column. For more information about the 
process of sender verification, see “Sender Verification” in the Cisco IronPort AsyncOS for Email 
Configuration Guide.

Hostname of the remote host, derived from Reverse DNS lookup.

IP address of the remote host.

Nickname of the listener on the Cisco IronPort appliance that is receiving the 
connection.

The number of concurrent connections from the remote host with the 
specified IP address open at the time when the command is run.

mail3.example.com> topin

Status as of:                   Sat Aug 23 21:50:54 2003

#  Remote hostname            Remote IP addr.   listener        Conn. In

1  mail.remotedomain01.com    172.16.0.2        Incoming01            10

2  mail.remotedomain01.com    172.16.0.2        Incoming02            10

3  mail.remotedomain03.com    172.16.0.4        Incoming01             5

4  mail.remotedomain04.com    172.16.0.5        Incoming02             4

5  mail.remotedomain05.com    172.16.0.6        Incoming01             3

6  mail.remotedomain06.com    172.16.0.7        Incoming02             3

7  mail.remotedomain07.com    172.16.0.8        Incoming01             3

8  mail.remotedomain08.com    172.16.0.9        Incoming01             3

9  mail.remotedomain09.com    172.16.0.10       Incoming01             3