TRENDnet TL2-FG142, Руководство пользователя

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TRENDnet User’s Guide
TL2-FG142
17
4.3.4.5 Relay
A DHCP relay agent is used to forward and to transfer DHCP messages between the
clients and the server when they are not in the same subnet domain. It stores the
incoming interface IP address in the GIADDR field of the DHCP packet. The DHCP server
can use the value of GIADDR field to determine the assigned subnet. For such condition,
please make sure the switch configuration of VLAN interface IP address and PVID(Port
VLAN ID) correctly.
Items Description
Relay Mode Indicates the DHCP relay mode operation.
Possible modes are:
Enabled: Enable DHCP relay mode operation. When DHCP relay mode
operation is enabled, the agent forwards and transfers DHCP messages
between the clients and the server when they are not in the same
subnet domain. And the DHCP broadcast message won't be flooded for
security considerations.
Disabled: Disable DHCP relay mode operation.
Relay Server
Relay Server Indicates the DHCP relay server IP address.
Relay
Information
Mode Indicates the DHCP relay information mode option operation. The option
82 circuit ID format as "[vlan_id][module_id][port_no]". The first four
characters represent the VLAN ID, the fifth and sixth characters are the
module ID(in standalone device it always equal 0, in stackable device it
means switch ID), and the last two characters are the port number. For
example, "00030108" means the DHCP message receive form VLAN ID 3,
switch ID 1, port No 8. And the option 82 remote ID value is equal the
switch MAC address.
Possible modes are:
Enabled: Enable DHCP relay information mode operation. When DHCP
relay information mode operation is enabled, the agent inserts specific
information (option 82) into a DHCP message when forwarding to DHCP
server and removes it from a DHCP message when transferring to DHCP
client. It only works when DHCP relay operation mode is enabled.
Disabled: Disable DHCP relay information mode operation.
Relay
Information
Policy Indicates the DHCP relay information option policy. When DHCP relay
information mode operation is enabled, if the agent receives a DHCP
message that already contains relay agent information it will enforce the
policy. The 'Replace' policy is invalid when relay information mode is
disabled. Possible policies are:
Replace: Replace the original relay information when a DHCP message
that already contains it is received.
Keep: Keep the original relay information when a DHCP message that
already contains it is received.
Drop: Drop the package when a DHCP message that already contains
relay information is received.
4.3.5 Security
There are several security features that have been embedded in switch software. There
are switch, network and AAA.
4.3.5.1 User
This page provides an overview of the current users. Currently the only way to login as
another user on the web server is to close and reopen the browser.
The displayed values for each user are:
Items Description