AnyConnect client broadcasts cause Asymmetric NAT log messages
If you can add a VPN filter that should resolve the problem, I had something similar on an IPSec VPN connection
This was a note that I saw and was made me configure VPN filter.
Use care when using the any keyword in permit entries in dynamic crypto maps. If the traffic covered by such apermit entry could include multicast or broadcast traffic, insert deny entries for the appropriate address range into the access list. Remember to insert deny entries for network and subnet broadcast traffic, and for any other traffic that IPsec should not protect.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...