March 2018
Intermediate to advanced
626 pages
17h 32m
English
book
Network Analysis Using Wireshark 2 Cookbook - Second Edition
by Nagendra Kumar Nainar, Yoram Orzach, Yogesh Ramdoss
Content preview from Network Analysis Using Wireshark 2 Cookbook - Second Edition
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Some rules of thumb are as follows:
- In case an SYN packet is answered with RST, look for the firewall that blocks the port numbers.
- Triple SYN without any answer occurs either due to an application that didn't respond, or a firewall that blocks the request on a specific port.
- Always verify that you have Network Address Translation (NAT), port forwarding, and mechanisms that play with TCP or UDP ports. These mechanisms can interfere with the standard operation of TCP.
When the TCP endpoints establish a new TCP connection, the sequence number in the SYN packet will start with an arbitrary number and will be sequentially incremented by 1 for every 1 byte. For ease of analysis, Wireshark replaces the sequence number with a relative ...
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