Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

After you have confirmed that the appliance is active on the network, use the following commands to 
pinpoint any network problems. 

You can use the

 netstat

 command to display network connections (both incoming and outgoing), 

routing tables, and a number of network interface statistics, including the following information:

List of active sockets

State of network interfaces

Contents of routing tables

Size of the listen queues

Packet traffic information

You can use the 

diagnostic -> network -> flush

 command to flush all network related caches.

You can use the 

diagnostic -> network -> arpshow

 command to show the system ARP cache.

You can use the 

packetcapture

 command to intercept and display TCP/IP and other packets being 

transmitted or received over a network to which the computer is attached. 

To use 

packetcapture

, set the network interface and the filter. The filter uses the same format the 

UNIX 

tcpdump

 command. Use 

start

 to begin the packet capture and 

stop

 to end it. After stopping 

the capture, you need to use SCP or FTP to download the files from the 

/pub/captures

 directory. 

For more information, see 

.

Use the 

ping

 command to a known working host to confirm that the appliance has an active 

connection on the network and is able to reach specific segments of your network. 

The 

ping

 command allows you to test connectivity to a network host from the appliance. 

mail3.example.com> ping

Which interface do you want to send the pings from?

1. Auto

2. Management (192.168.42.42/24: mail3.example.com)

3. PrivateNet (192.168.1.1/24: mail3.example.com)

4. PublicNet (192.168.2.1/24: mail3.example.com)

[1]> 1

Please enter the host you wish to ping.

[]> anotherhost.example.com

Press Ctrl-C to stop.

PING anotherhost.example.com (x.x.x.x): 56 data bytes