How ssh works, Configuring arp filtering, Configuration example – H3C Technologies H3C S12500-X Series Switches User Manual
Page 243: Configuration guidelines
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Configuration example
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Network requirements
As shown in
934H
Figure 73
, Host B launches gateway spoofing attacks to Switch B. As a result, traffic that
Switch B intends to send to Switch A is sent to Host B.
Configure Switch B to block such attacks.
Figure 73 Network diagram
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Configuration procedure
# Configure ARP gateway protection on Switch B.
<SwitchB> system-view
[SwitchB] interface ten-gigabitethernet 1/0/1
[SwitchB-Ten-GigabitEthernet1/0/1] arp filter source 10.1.1.1
[SwitchB-Ten-GigabitEthernet1/0/1] quit
[SwitchB] interface ten-gigabitethernet 1/0/2
[SwitchB-Ten-GigabitEthernet1/0/2] arp filter source 10.1.1.1
After the configuration is complete, Ten-GigabitEthernet 1/0/1 and Ten-GigabitEthernet 1/0/2 discard
the incoming ARP packets whose sender IP address is the IP address of the gateway.
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Configuring ARP filtering
The ARP filtering feature can prevent gateway spoofing and user spoofing attacks.
An interface enabled with this feature checks the sender IP and MAC addresses in a received ARP packet
against permitted entries. If a match is found, the packet is handled correctly. If not, the packet is
discarded.
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Configuration guidelines
When you configure ARP filtering, follow these guidelines:
•
You can configure a maximum of eight permitted entries on an interface.