Hi, I was also looking at this, Can you clarify the query. Is this anyway related to the TCP control flags like for 0x19 which is in binary 0001 1001, If we relate it to the TCP header options, the packet will have FIN-PSH-ACK bit set. Similary for 0x53, in binary 0101 0011. This will have FIN-SYN-ACK-ECN bits set. I didnt run tcpdump or wireshark. but trying to understand it from the firewall logs.
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