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YML733 Rev1
NB4 User Guide
www.netcomm.com.au
31
SNMP
The Simple Network Management Protocol(SNMP) let a network administrator monitor on a
network by retrieving settings on remote network devices. Network administrator typically
runs an SNMP management station program such as MIB browser on a local host to obtain
information from an SNMP agent such as the router you use now.
Vendor OID:
The enterprise OID to which the system belongs to.
Name:
Enter information about the system name in the system contact field.
Location:
Enter information about the system contact person in the system contact
field.
Contact:
Enter information about the system contact person in the system contact
field.
Idle time out:
The period of time which allows SNMP to be idle before exit.
Name:
Community name.
Access Right:
Select ReadOnly or ReadWrite.
Apply:
Click Apply to save the changes.
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NB4 User Guide
YML733Rev1
32
www.netcomm.com.au
LAN Clients
LAN Client names are a way of applying specific Port-forwarding and Access Control rules to
individual computers on the LAN.
If DHCP is used, all DHCP clients are automatically
assigned and are designated as a LAN client.
To add a LAN client, click Advanced>Advanced Features>LAN Clients.
New IP Address:
Enter the IP Address.
Hostname:
Enter the Hostname.
Apply:
Click Apply to save the changes.
Page 33 / 77
YML733 Rev1
NB4 User Guide
www.netcomm.com.au
33
MacFilters
MAC filtering enables rules to be defined which allow or deny data to pass through the Router
based on the source and destination MAC address and data type of each data frame.
To access MAC Filters Control, click on Advanced>Advanced Features>MAC Filters .
Usage examples of MAC Filter Rules are: to specify which computers on a network are
allowed Internet access; or to determine which particular computers are allowed to access
services provided by the Router (the last point is particularly relevant for routers serving
Wireless Networks as it can be used to prevent unauthorised people from attaching themselves
to a wireless LAN).
Enable/Disable MAC Filtering
To enable MAC filtering, navigate to the MAC Filter Control Screen and select the Enable
MAC Filters check box.
If the check box is selected, MAC filtering is enabled according to the list of MAC Filter Rules
that has been created.
If the box is de-selected, MAC Filtering will not be enabled, even if MAC Filter Rules have
been created.
Create MAC Filter Rules
Enter the Source MAC and Destination MAC details.
Entering zeros or blanks into the Source
or Destination fields enters a null value.
'Protocol' provides the choice of protocol type for the rule.
'Mode' provides the choice of Allow or Deny for the rule.
When all selections are made, click on Add to add the rule to the list of rules. A maximum of
20 MAC Filter Rules can be defined and saved.
To save changes, click on Save Settings on the left-hand menu.
Page 34 / 77
NB4 User Guide
YML733Rev1
34
www.netcomm.com.au
Edit or Delete MAC Filter Rules
To edit an existing MAC Filter Rule, click the radio button adjacent to the Filter Rule name.
The Rule will then appear in the top half of the MAC Filter control screen where it can be
edited. When editing is complete, click 'Add' to return the Rule to the list of existing rules.
To delete MAC Filter Rules, click on the 'Delete' tick box; multiple deletions can be made by
shift-clicking Delete tick boxes; Select All will select every rule.
When the desired selections
are made, effect deletion by clicking on Apply.
To save changes, click on Save Settings on the left-hand menu.
Hidden MAC Filter Rules
The MAC filter table contains three hidden rules. These rules are built into the Router to ensure
the user does not become locked out by entering a rule which prevents further access to the
router.
The first rule allows any and all ARP frames through the system.
The second rule allows all IPv4 frames with the destination MAC address of the bridge to go
through.
The third rule allows all IPv4 frames with the source MAC address of the bridge to go through.
TIP: To find the MAC address of a Windows-based computer, at the DOS prompt type:
ipconfig /all.
Page 35 / 77
YML733 Rev1
NB4 User Guide
www.netcomm.com.au
35
Multicast
IGMP [=Internet Group Management Protocol] Multicast enables communication between a
single sender and multiple receivers on a network. It is used when data needs to be sent from
one to many devices. Typical uses might include the updating of mobile personnel from a
home office or the periodic publishing of an online newsletter. Multicasting provides efficien-
cies which enable it to use less network bandwidth than the sending of the same data by other
means [e.g. SMTP].
To access Multicasting, click on Advanced>Advanced Features>Multicast.
To enable Multicast, open the multicast screen and select the Enable IGMP Multicast.

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