ZyXEL Communications XS3800-28, User Manual, Page: 639 / 789

Chapter 84 ARP Inspection
XS3800-28 User’s Guide
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The following table describes the labels in this screen.
84.15 Technical Reference
This section provides technical background information on the topics discussed in this chapter.
84.15.1 ARP Inspection Overview
Use ARP inspection to filter unauthorized ARP packets on the network. This can prevent many kinds of
man-in-the-middle attacks, such as the one in the following example.
Table 348 SECURITY > IPv6 Source Guard > DHCPv6 Trust Setup
LABEL DESCRIPTION
Trust Setting
Active Enable the switch button to specify whether ports are trusted or untrusted ports for DHCP
snooping. If you do not select this then
IPv6 DHCP Trust is not used and all ports are
automatically trusted.
Port Setting
SLOT This field appears only in Stacking mode. Click the drop-down list to choose the slot number of
the Switch in a stack.
Port This field displays the port number. In Stacking mode, the first number represents the slot ID
and the second is the port number. Please note that the default stacking ports (the last four
ports of your Switch) cannot be configured. They are reserved for stacking only.
* Settings in this row apply to all ports.
Use this row only if you want to make some settings the same for all ports. Use this row first to set
the common settings and then make adjustments on a port-by-port basis.
Note: Changes in this row are copied to all the ports as soon as you make them.
Trusted State Select whether this port is a trusted port ( Trusted ) or an untrusted port ( Untrusted ).
Trusted ports are connected to DHCPv6 servers or other switches.
Untrusted ports are connected to subscribers, and the Switch discards DHCPv6 packets from
untrusted ports in the following situations:
• The packet is a DHCPv6 server packet (for example, ADVERTISE, REPLY, or RELAY-REPLY).
• The source MAC address and source IP address in the packet do not match any of the
current bindings.
Apply Click Apply to save your changes to the Switch’s run-time memory. The Switch loses these
changes if it is turned off or loses power, so use the Save link on the top navigation panel to
save your changes to the non-volatile memory when you are done configuring.
Cancel Click this to reset the values in this screen to their last-saved values.