
Lantronix
SM24TBT2DPA and SM24TBT2DPB Web User Guide
2-5.2.5.2 VLAN Mode Configuration
ARP Inspection is a security feature. Several types of attacks can be launched against a host or devices
connected to Layer 2 networks by "poisoning" the ARP caches. This feature is used to block such attacks.
Only valid ARP requests and responses can go through the switch.
Each page shows up to 9999 entries from the VLAN table, default being 20, selected through the "entries
per page" input field. When first visited, the web page will show the first 20 entries from the beginning of
the VLAN Table. The first displayed will be the one with the lowest VLAN ID found in the VLAN Table.
The "VLAN" input fields let you select the starting point in the VLAN Table. Clicking the Refresh button will
update the displayed table starting from that or the closest next VLAN Table match.
The >> (Next entry) button will use the next entry of the currently displayed VLAN entry as a basis for the
next lookup. When the end is reached, the warning message is shown in the displayed table. Use the
<<
button to start over.
Web Interface
To configure VLAN Mode parameters in the web UI:
1. Navigate to Configuration > Security > Network > ARP Inspection > VLAN Configuration.
2. Click “Add New Entry”.
3. Specify the VLAN ID and Log Type.
4. Click Apply.
Figure 2-4.2.6.2: VLAN Mode Configuration page
Parameter descriptions:
VLAN Mode Configuration:
Specify ARP Inspection is enabled on which VLANs. First, enable the port
setting on Port mode configuration web page. Only when both Global Mode and Port Mode on a given port
are enabled, ARP Inspection is enabled on this given port. Second, you can specify which VLAN will be
inspected on VLAN mode configuration web page. The Log Type also can be configured on per VLAN
setting. Possible Log Types are:
None
:
Log nothing.
Deny
:
Log denied entries.
Permit
:
Log permitted entries.
ALL
:
Log all entries.