We will be having a state audit for CJIS. CJIS now requires 256 AES. All I can find online is the MX using 128 AES, and lots of AES information on Non-Meraki to Meraki.
Re: Encryption Level for AutoVPN (Meraki to Meraki)
Meraki was supposed to be moving to AES256, but I don't think I've seen anything officially announced. Might be worth it to call into support and ask them about this.
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