User Guide

CHAPTER

37-1

AsyncOS 9.1.2 for Cisco Email Security Appliances User Guide

Advanced Network Configuration

This chapter includes information about advanced network configuration generally available via the

etherconfig command, such as NIC pairing, VLANs, Direct Server Return, and more.

• Media Settings on Ethernet Interfaces, page 37-1

• Network Interface Card Pairing/Teaming, page 37-3

• Virtual Local Area Networks (VLANs), page 37-6

• Direct Server Return, page 37-13

• Ethernet Interface’s Maximum Transmission Unit, page 37-18

Media Settings on Ethernet Interfaces

Media settings for the ethernet interfaces can be accessed via the use of the etherconfig command. Each

ethernet interface is listed with its current setting. By selecting the interface, the possible media settings

are displayed. See Example of Editing Media Settings, page 37-2 for an example.

Using etherconfig to Edit Media Settings on Ethernet Interfaces

The etherconfig command can be used to set the duplex settings (full/half) as well as the speed

(10/100/1000 Mbps) of ethernet interfaces. By default, interfaces automatically select the media

settings; however, in some cases you may wish to override this setting.

Note If you have completed the GUI’s System Setup Wizard (or the Command Line Interface systemsetup

command) as described in the “Setup and Installation” chapter and committed the changes, the default

ethernet interface settings should already be configured on your appliance.

Note Some appliances contain a fiber optic network interface option. If available, you will see two additional

ethernet interfaces (Data 3 and Data 4) in the list of available interfaces on these appliances. These

gigabit fiber optic interfaces can be paired with the copper (Data 1, Data 2, and Management) interfaces

in a heterogeneous configuration. See Network Interface Card Pairing/Teaming, page 37-3.