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Configuring IP source guard
Overview
IP source guard (IPSG) prevents spoofing attacks by using an IPSG binding table to match
legitimate packets. It drops packets that do not match the table. IPSG is a per-interface packet filter.
Configuring the feature on one interface does not affect packet forwarding on another interface.
The IPSG binding table can include global and interface-specific bindings. IPSG first uses the
interface-specific bindings to match packets. If no match is found, IPSG uses the global bindings.
The IPSG bindings fall into the following types:
•
IP.
•
MAC.
•
IP-MAC.
•
IP-VLAN.
•
MAC-VLAN.
•
IP-MAC-VLAN.
IPSG bindings can be static or dynamic.
•
Static
bindings
—
Configured manually. Global IPSG supports only static IP-MAC bindings. For
more information about global static IPSG bindings, see "
•
Dynamic
bindings
—Generated based on information from other modules. For more
information about dynamic bindings, see "
As shown in
, IPSG forwards only the packets that match an IPSG binding.
Figure 121 IPSG application
Static IPSG bindings
Static IPSG bindings are configured manually. They are suitable for scenarios where few hosts exist
on a LAN and their IP addresses are manually configured. For example, you can configure a static
IPSG binding on an interface that connects to a server. This binding allows the interface to receive
packets only from the server.
Static IPSG bindings on an interface implements the following functions:
•
Filter incoming IPv4 or IPv6 packets on the interface.
•
Cooperate with ARP attack detection in IPv4 for user validity checking.
For information about ARP attack detection, see "
Configuring ARP attack protection
Static IPSG bindings can be global or interface-specific.
IP network
Invalid host
Valid host
Configure the IP source guard
feature on the interface
IPSG bindings
1.1.1.1
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1.1.1.1
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