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324
Table 94
Configuration items
Item Description
DHCP Service
Enable or disable global DHCP.
Unauthorized Server
Detect
Enable or disable unauthorized DHCP server detection.
There are unauthorized DHCP servers on networks, which reply DHCP clients with
wrong IP addresses.
With this feature enabled, upon receiving a DHCP request, the DHCP relay agent will
record the IP address of any DHCP server that assigned an IP address to the DHCP
client and the receiving interface. The administrator can use this information to check
out DHCP unauthorized servers. The device puts a record once for each DHCP
server. The administrator needs to find unauthorized DHCP servers from the log
information. After the information of recorded DHCP servers is cleared, the relay
agent will re-record server information following this mechanism.
Dynamic Bindings
Refresh
Enable or disable periodic refresh of dynamic client entries, and set the refresh
interval.
A DHCP client sends a DHCP-RELEASE unicast message to the DHCP server through
the DHCP relay agent to relinquish its IP address. In this case the DHCP relay agent
simply conveys the message to the DHCP server, thus it does not remove the IP
address from dynamic client entries. To solve this problem, the periodic refresh of
dynamic client entries feature is introduced.
With this feature, the DHCP relay agent uses the IP address of a client and the MAC
address of the DHCP relay agent interface to periodically send a DHCP-REQUEST
message to the DHCP server.
•
If the server returns a DHCP-ACK message or does not return any message within
a specified interval, which means that the IP address is assignable now, the DHCP
relay agent will age out the client entry.
•
If the server returns a DHCP-NAK message, which means the IP address is still in
use, the relay agent will not age it out.
Note that if the
Auto
option is selected, the refresh interval is calculated by the relay
agent according to the number of client entries.
Track Timer Interval
Creating a DHCP server group
1.
Select
Network
>
DHCP
from the navigation tree to enter the
DHCP Relay
page shown in
Figure
289
.
2.
In the
Server Group
area, click
Add
to enter the server group configuration page.
Figure 290
Creating a server group
3.
Configure the DHCP server group as described in
Table 95.
Содержание Compaq Presario,Presario 1910
Страница 35: ...22 Figure 16 Sort display based on MAC address in the ascending order ...
Страница 54: ...41 Figure 27 Configuration finishes ...
Страница 70: ...57 Figure 42 Configuring idle timeout period 3 Set the idle timeout period for logged in users 4 Click Apply ...
Страница 98: ...85 Figure 67 Displaying the rate settings of ports ...
Страница 114: ...101 Figure 82 Port traffic statistics NOTE When the bandwidth utilization is lower than 1 1 is displayed ...
Страница 158: ...145 Field Description OutErrors Number of invalid packets sent through the interface ...
Страница 202: ...189 Figure 177 Creating a static MAC address entry ...
Страница 230: ...217 Figure 193 Configuring MSTP globally on Switch D ...
Страница 359: ...346 5 View the operation result in the Summary area Figure 316 IPv6 traceroute operation result ...