option82 can obtain more user information, so as to assign the IP to users more accurately.
The format of option82 that uploaded by DHCP snooping is shown as follows:
Figure 14-2 Agent Circuit ID
Figure 14-3 Agent Remote ID
14.1.4 Related Security Functions of DHCP
snooping
Under the DHCP network environment, the administrators usually suffer from such problem
that some users modify the used the static IP address other than the dynamic IP address,
and the use of the static IP address will cause some users who have the priority to use the
dynamic IP address can not use the network normally, which increases the complication of
the network application environment and make it harder for administrators to manage the
network. The DHCP dynamic binding means that the device will obtain the information by
recording the IP address of the legal users during the DHCP snooping, and carry out related
record and associated security processing. Current security control provides two ways, the
one is the address binding function that used the hardware filtration, and the other is the DAI
(dynamic arp inspection) that used the software, to carry out the legality check of users by
the control of ARP.
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