Built inbound/outbound TCP connection vs TCP 3 way handshake
Hi all, I have a few questions:
1. I was wondering when we see the following message on syslog, does it mean that TCP 3 way handshake has been completed or does it mean only SYN flag has been sent to the destination (192.168.1.1)?
%ASA-6-302013: Built inbound TCP connection 101 for outside:172.16.1.1/1337 to inside:192.168.1.1/23 (192.168.1.1/23)
2. In packet capture below, normally we’ll know that data has been transferred by looking at PUSH & ACK flag (P & ack). How about syslog message since we cannot see the TCP flag in it? Is there similar message in syslog shows that data has been transferred between source and destination?
3. Sometimes, we also experience SYN flag has been sent by source, but there is not reply (SYN/ACK) from the destination. Since the source address does not receive the SYN/ACK, the destination finally will send RST to terminate the connection. Can we see this message on the syslog?
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