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Invalid tcp handshake behaviour

asked 2020-02-15 09:03:24 +0000

updated 2020-02-15 12:41:22 +0000

grahamb gravatar image

Hello, I need some help. I'm using pcap.net for sending a tcp raw packet inside a LAN with some payload data. In order to be able to send the packet I need to perform a tcp handshake before sending the payload. I verified that no firewall is active in both endpoints. Also, use netstat -a / nmap scan to verify that the used ports are in "listening" state. Details for the endpoints:

source ip  - 10.0.0.7
source port - 2869
destination ip - 10.0.0.11
destination port - 5357

When sending a syn from 10.0.0.7, it can be seen that 10.0.0.11 responds with SYN-ACK. However, as I understand from the documentation, 10.0.0.7 RST the connection and right afterwards send an ACK.

The behavior always occurs and I don't know it the tcp handshake is valid. I need your help.

wireshark export file: https://drive.google.com/file/d/1zrZX...

image: https://drive.google.com/file/d/1pso_... Thank you

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answered 2020-02-15 12:42:04 +0000

grahamb gravatar image

updated 2020-02-15 12:42:28 +0000

This isn't really a Wireshark issue, more one for the support systems for pcap.net. Wireshark is showing you what's happening, but the actual problem lies in your use of pcap.net.

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Asked: 2020-02-15 09:03:24 +0000

Seen: 38 times

Last updated: Feb 15