Qtech QSW-2800v2 Руководство пользователя онлайн [102/230] 481607

Qtech QSW-2800v2 Руководство пользователя онлайн [102/230] 481607
Chapter4 Router Configuration
3-8
the expansion application of option82, DHCP Server itself must support option82 and
the message received must be inserted option82 information.
Option82 can identify different users and Server can allocate different IP address for
different users according to option82 so as to realize QoS, security and accounting
management.
DHCP Relay Security Function
Address Matching Detection Function
When DHCP Client obtains IP address from DHCP Server by DHCP Relay,
DHCP Relay will record the binding relationship of IP address and MAC address.
User can also configure user address table item manually (static binding of IP
address and MAC address). In order to prevent illegal user from configuring an IP
address statically and accessing other network, device supports address
matching check function of DHCP Relay. When enabling this function on device,
if the corresponding relationship of user configured IP address and user MAC
address is not in the user address table of DHCP Relay (including the
dynamically recorded table of DHCP Relay and manually configured user
address table item), then DHCP Relay will not allow this user to access network
outside.
Figure DHCP Security Topology
User Table Timing Updating Function

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