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dmcgrath.ca
Beginner

Dual wired and wireless connection with DAI

Hi,

I have a set of wired and wireless (WLC) networks in the same VLAN and noticed that some traffic is tripping up the %SW_DAI-4-DHCP_SNOOPING_DENY.

I did some digging, and it appears that clients that are connected to both wired and wireless networks, upon having their wired interface bounce, start to ARP out to an IP with their Wired MAC but their Wireless IP, which trips up the DAI:

%SW_DAI-4-DHCP_SNOOPING_DENY: 1 Invalid ARPs (Req) on Gi1/0/1, vlan 100.([aaaa.aaaa.aaaa/10.123.45.67/0000.0000.0000/10.123.45.68/00:00:00 UTC Wed Feb 1 2021])

Where aaaa.aaaa.aaaa is the clients wired MAC but the IP they are using was from the WiFi. There appear to also be times where the client uses their WiFi MAC and IP out their wired interface, iirc.

Some tests with the WiFi interface disabled shows no more DAI logs, but I was curious if there is a way (without arp trusting the entire network) to deal with or allow this type of scenario without having to reconfigure the clients to only use one interface?

Any tips would be much appreciated! Thanks!

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