Planet LRP-822CS, Руководство пользователя

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User’s Manual of LRP-822CS
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4.9.7 DHCP Snooping
4.9.7.1 DHCP Snooping Overview
The addresses assigned to DHCP clients on unsecure ports can be carefully controlled using the dynamic bindings registered
with DHCP Snooping. DHCP snooping allows a switch to protect a network from rogue DHCP servers or other devices which
send port-related information to a DHCP server. This information can be useful in tracking an IP address back to a physical port.
Command Usage

Network traffic may be disrupted when malicious DHCP messages are received from an outside source.
DHCP snooping is
used to filter DHCP messages received on a non-secure interface from outside the network or firewall
. When DHCP
snooping is enabled globally and enabled on a VLAN interface,
DHCP messages received on an untrusted interface from
a device not listed in the DHCP snooping table will be dropped
.

Table entries are only learned for trusted interfaces. An entry is added or removed dynamically to the DHCP snooping table
when a client receives or releases an IP address from a DHCP server. Each entry includes a MAC address, IP address,
lease time, VLAN identifier, and port identifier.

When DHCP snooping is enabled, DHCP messages entering an untrusted interface are filtered based upon dynamic entries
learned via DHCP snooping.

Filtering rules are implemented as follows: