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20.3
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 Device.
Figure 138
System Monitor > Traffic Status > LAN
The following table describes the fields in this screen.
Table 105
System Monitor > Traffic Status > LAN
LABEL
DESCRIPTION
Refresh Interval
Select how often you want the Device 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.
more...hide
more
Click
more...
to show more information. Click
hide more
to hide them.
Interface
This shows the LAN or WLAN interface.
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.
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20.4
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 Device.
Figure 139
System Monitor > Traffic Status > NAT
The following table describes the fields in this screen.
Table 106
System Monitor > Traffic Status > NAT
LABEL
DESCRIPTION
Refresh Interval
Select how often you want the Device to update this screen.
Device Name
This displays the name of the connected host.
IPv4 Address
This displays the IPv4 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 Device can support is currently
being used by all connected hosts.
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C
HAPTER
21
VoIP Status
21.1
The VoIP Status Screen
Click
System Monitor > VoIP Status
to open the following screen. You can view the VoIP
registration, current call status and phone numbers in this screen.
Figure 140
System Monitor > VoIP Status
The following table describes the fields in this screen.
Table 107
System Monitor > VoIP Status
LABEL
DESCRIPTION
Poll Interval(s)
Enter the number of seconds the Device needs to wait before updating this screen and then
click
Set Interval
. Click
Stop
to have the Device stop updating this screen.
SIP Status
Account
This column displays each SIP account in the Device.
Registration
This field displays the current registration status of the SIP account. You can change this in
the
Status
screen.
Registered
- The SIP account is registered with a SIP server.
Not Registered
- The last time the Device tried to register the SIP account with the SIP
server, the attempt failed. The Device automatically tries to register the SIP account when
you turn on the Device or when you activate it.
Inactive
- The SIP account is not active. You can activate it in
VoIP > SIP > SIP
Account
.
Registration
Time
This field displays the last time the Device successfully registered the SIP account. The field
is blank if the Device has never successfully registered this account.
URI
This field displays the account number and service domain of the SIP account. You can
change these in the
VoIP > SIP
screens.
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Message
Waiting
This field indicates whether or not there are any messages waiting for the SIP account.
Last Incoming
Number
This field displays the last number that called the SIP account. The field is blank if no
number has ever dialed the SIP account.
Last Outgoing
Number
This field displays the last number the SIP account called. The field is blank if the SIP
account has never dialed a number.
Call Status
Account
This column displays each SIP account in the Device.
Duration
This field displays how long the current call has lasted.
Status
This field displays the current state of the phone call.
Idle
- There are no current VoIP calls, incoming calls or outgoing calls being made.
Dial
- The callee’s phone is ringing.
Ring
- The phone is ringing for an incoming VoIP call.
Process
- There is a VoIP call in progress.
DISC
- The callee’s line is busy, the callee hung up or your phone was left off the hook.
Codec
This field displays what voice codec is being used for a current VoIP call through a phone
port.
Peer Number
This field displays the SIP number of the party that is currently engaged in a VoIP call
through a phone port.
Phone Status
Phone
This field displays the name of a phone port on the Device.
Outgoing
Number
This field displays the SIP number that you use to make calls on this phone port.
Incoming
Number
This field displays the SIP number that you use to receive calls on this phone port.
Table 107
System Monitor > VoIP Status (continued)
LABEL
DESCRIPTION
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HAPTER
22
ARP Table
22.1
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.
22.1.1
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.
22.2
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 141
System Monitor > ARP Table

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