Differences between IPSG and DAI of S series switches

For S series switches, both IP Source Guard (IPSG) and Dynamic ARP Inspection (DAI) use binding tables (static binding table or DHCP snooping binding table) to filter packets.
�?IPSG filters IP packets by using binding tables. A switch matches IP packets received by interfaces against binding entries, and forwards the packets matching the binding entries.
- DAI filters ARP packets by using binding tables. A switch matches ARP packets received by interfaces against binding entries, and forwards the ARP packets matching the binding entries.
- IPSG prevents IP address spoofing attacks. For example, a malicious host steals an authorized host's IP address to access the network or initiate attacks.
- DAI can prevent man-in-the-middle attacks. Man-in-the-middle attacks are generally initiated through ARP spoofing. That is, the attacker leads traffic to itself to intercept other hosts' information.
- IPSG cannot prevent address conflicts. For example, when a malicious host steals an online host's IP address, the ARP request packets sent by the malicious host will be sent to the online host through broadcast, causing an address conflict. To prevent IP address conflicts, you can configure both IPSG and DAI.
- IPSG and DAI resolve different issues and meet different requirements. To ensure network security, you can configure both of them.

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