Thanks for replay and sorry for the late response.
The traffic is not shown in the datapath table session:
#show datapath session table 192.168.1.149
Datapath Session Table Entries
------------------------------
Flags: F - fast age, S - src NAT, N - dest NAT
D - deny, R - redirect, Y - no syn
H - high prio, P - set prio, T - set ToS
C - client, M - mirror, V - VOIP
Q - Real-Time Quality analysis
u - Upstream Real-Time Quality analysis
I - Deep inspect, U - Locally destined
E - Media Deep Inspect, G - media signal
r - Route Nexthop, h - High Value
A - Application Firewall Inspect
B - Permanent, O - Openflow
L - Log
Source IP Destination IP Prot SPort DPort Cntr Prio ToS Age Destination TAge Packets Bytes Flags
--------------- --------------- ---- ----- ----- -------- ---- --- --- ----------- ---- --------- --------- ---------------
192.168.1.149 192.168.1.255 17 137 137 0/0 0 0 1 tunnel 14 8f 46 3588 FC
192.168.1.149 224.0.0.252 17 49755 5355 0/0 0 0 0 tunnel 14 2 2 104 FC
192.168.1.149 224.0.0.252 17 64857 5355 0/0 0 0 0 tunnel 14 5 0 0 FC
192.168.1.149 224.0.0.252 17 61096 5355 0/0 0 0 1 tunnel 14 12 0 0 FC
192.168.1.149 224.0.0.252 17 63715 5355 0/0 0 0 0 tunnel 14 2 2 104 FC
192.168.1.255 192.168.1.149 17 137 137 0/0 0 0 9 tunnel 14 90 0 0 FY
Do you have another idea?