[  257.010254][    C1] TCP: AO hash mismatch for [2001:db8:254::1].7011->[2001:db8:1::1].40152 [P.]L3index: 0
[  257.010889][    C3] TCP: AO hash mismatch for [2001:db8:1::1].40152->[2001:db8:254::1].7011 [P.]L3index: 0
[  258.034078][    C1] TCP: AO hash mismatch for [2001:db8:254::1].7012->[2001:db8:1::1].52456 [P.]L3index: 0
[  258.034201][    C2] TCP: AO hash mismatch for [2001:db8:1::1].52456->[2001:db8:254::1].7012 [P.]L3index: 0
[  258.273198][    C1] TCP: request_sock_TCPv6: Possible SYN flooding on port [2001:db8:254::1]:7010. Sending cookies.