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rDNS, how?
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this post was submitted on 21 Aug 2023
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See this page here that explains the
Flags: https://opensource.com/article/18/10/introduction-tcpdumpTypically, in a TCP connection, you'd SYN, SYN+ACK, ACK, then transfer actual data over. In the successful sequence, you see this happening as expected.
In the unsuccessful sequence, it seems to be stuck in SYN, SYN+ACK, but there is no ACK that follows (
Flags [.]).Where is the second one captured? On the user's system, or on your system? Something in between is determining the packet isn't intended for the destination and dropping it. It may be a firewall, it may be something else.