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Page 221 / 327 Scroll up to view Page 216 - 220
VMG3926-B10A User’s Guide
221
C
HAPTER
22
Traffic Status
22.1
Overview
Use the
Traffic Status
screens to look at network traffic status and statistics of the WAN, LAN
interfaces and NAT.
22.1.1
What You Can Do in this Chapter
•
Use the
WAN
screen to view the WAN traffic statistics (
Section 22.2 on page 221
).
•
Use the
LAN
screen to view the LAN traffic statistics (
Section 22.3 on page 222
).
•
Use the
NAT
screen to view the NAT status of the VMG’s client(s) (
Section 22.4 on page 223
)
22.2
The WAN Status Screen
Click
System Monitor > Traffic Status
to open the
WAN
screen. The figure in this screen shows
the number of bytes received and sent on the VMG.
Figure 129
System Monitor > Traffic Status > WAN
The following table describes the fields in this screen.
Table 99
System Monitor > Traffic Status > WAN
LABEL
DESCRIPTION
Connected
Interface
This shows the name of the WAN interface that is currently connected.
Packets Sent
Data
This indicates the number of transmitted packets on this interface.
Error
This indicates the number of frames with errors transmitted on this interface.
Drop
This indicates the number of outgoing packets dropped on this interface.
Page 222 / 327
Chapter 22 Traffic Status
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222
22.3
The LAN Status Screen
Click
System Monitor > Traffic Status
> LAN
to open the following screen. The figure in this
screen shows the interface that is currently connected on the VMG.
Figure 130
System Monitor > Traffic Status > LAN
The following table describes the fields in this screen.
Packets Received
Data
This indicates the number of received packets on this interface.
Error
This indicates the number of frames with errors received on this interface.
Drop
This indicates the number of received packets dropped on this interface.
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to show more information. Click
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to hide them.
Disabled
Interface
This shows the name of the WAN interface that is currently disconnected.
Packets Sent
Data
This indicates the number of transmitted packets on this interface.
Error
This indicates the number of frames with errors transmitted on this interface.
Drop
This indicates the number of outgoing packets dropped on this interface.
Packets Received
Data
This indicates the number of received packets on this interface.
Error
This indicates the number of frames with errors received on this interface.
Drop
This indicates the number of received packets dropped on this interface.
Table 99
System Monitor > Traffic Status > WAN (continued)
LABEL
DESCRIPTION
Table 100
System Monitor > Traffic Status > LAN
LABEL
DESCRIPTION
Refresh Interval
Select how often you want the VMG to update this screen.
Interface
This shows the LAN or WLAN interface.
Bytes Sent
This indicates the number of bytes transmitted on this interface.
Bytes Received
This indicates the number of bytes received on this interface.
Interface
This shows the LAN or WLAN interfaces.
Page 223 / 327
Chapter 22 Traffic Status
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223
22.4
The NAT Status Screen
Click
System Monitor > Traffic Status
> NAT
to open the following screen. The figure in this
screen shows the NAT session statistics for hosts currently connected on the VMG.
Figure 131
System Monitor > Traffic Status > NAT
The following table describes the fields in this screen.
Sent (Packets)
Data
This indicates the number of transmitted packets on this interface.
Error
This indicates the number of frames with errors transmitted on this interface.
Drop
This indicates the number of outgoing packets dropped on this interface.
Received (Packets)
Data
This indicates the number of received packets on this interface.
Error
This indicates the number of frames with errors received on this interface.
Drop
This indicates the number of received packets dropped on this interface.
Table 100
System Monitor > Traffic Status > LAN (continued)
LABEL
DESCRIPTION
Table 101
System Monitor > Traffic Status > NAT
LABEL
DESCRIPTION
Refresh Interval
Select how often you want the VMG to update this screen.
Device Name
This displays the name of the connected host.
IP Address
This displays the IP address of the connected host.
MAC Address
This displays the MAC address of the connected host.
No. of Open
Session
This displays the number of
NAT sessions currently opened for the connected host.
Total
This displays what percentage of NAT sessions the VMG can support is currently being used
by all connected hosts. You can also see the number of active NAT sessions and the
maximum number of NAT sessions the VMG can support.
Page 224 / 327
Chapter 22 Traffic Status
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Page 225 / 327
VMG3926-B10A User’s Guide
225
C
HAPTER
23
ARP Table
23.1
Overview
Address Resolution Protocol (ARP) is a protocol for mapping an Internet Protocol address (IP
address) to a physical machine address, also known as a Media Access Control or MAC address, on
the local area network.
An IP (version 4) address is 32 bits long. In an Ethernet LAN, MAC addresses are 48 bits long. The
ARP Table maintains an association between each MAC address and its corresponding IP address.
23.1.1
How ARP Works
When an incoming packet destined for a host device on a local area network arrives at the device,
the device's ARP program looks in the ARP Table and, if it finds the address, sends it to the device.
If no entry is found for the IP address, ARP broadcasts the request to all the devices on the LAN.
The device fills in its own MAC and IP address in the sender address fields, and puts the known IP
address of the target in the target IP address field. In addition, the device puts all ones in the target
MAC field (FF.FF.FF.FF.FF.FF is the Ethernet broadcast address). The replying device (which is either
the IP address of the device being sought or the router that knows the way) replaces the broadcast
address with the target's MAC address, swaps the sender and target pairs, and unicasts the answer
directly back to the requesting machine. ARP updates the ARP Table for future reference and then
sends the packet to the MAC address that replied.
23.2
ARP Table Screen
Use the ARP table to view IP-to-MAC address mapping(s). To open this screen, click
System
Monitor
>
ARP Table
.
Figure 132
System Monitor > ARP Table

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