June 2015
Intermediate to advanced
190 pages
4h 4m
English
Content preview from Troubleshooting CentOSBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Packet analysis with tcpdump
The tcpdump command is a packet analyzer that is able to capture and provide a description of the traffic being transmitted across a network interface. It is common to most flavors of Linux, and it provides access to a unique view of the network at the packet level that can prove vital when troubleshooting the network environment.
The basic syntax for using tcpdump is expressed in the following way:
# tcpdump -i <device_name>
You can also specify a protocol like this:
# tcpdump -i <device_name> tcp
While a port value can be used in the following way:
# tcpdump -i <device_name> port 22
Verbosity options can be issued by using -v or -vv, while DNS can be avoided with the -n option. However, because tcpdump will continue ...
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