![]() Tcpdump man pages include complete filter syntax however, here are some of the more useful ones: Specifying hosts host 192.168.1.10 - capture traffic with source or destination is 192.168.1.10 dst host 192.168.1.10 - capture traffic with destination host is 192.168.1.10 src host 192.168.1.10 - capture traffic where source is 192.168.1.10 Specifying networks net 192.168.1.0/24 - capture traffic to or from 192.168.1.0/24 dst net 192.168.1.0 mask 255.255.255.0 - capture traffic destined for 192.168.1.0/24 network src net localnet - capture traffic coming from local network network Specifying ports port 80 - capture traffic to or from port 80 (source port 22 and destination port 50000 will be captured. This will clean up the timestamp and avoid name resolution: tcpdump -ttttnnr capture.pcap "host 192.168.1.10 It is recommended to use the following commandline to speed up reading existing pcap files. produced by tcpdump -w capture.pcap -s 1550), you can utilize -r flag combined with the same filter: tcpdump -r capture.pcap "host 192.168.1.10" In case you need to filter a previously saved pcap file (e.g. Here is a simple example to capture LIVE packets coming to and from 192.168.1.10: tcpdump -i eth0 -ttttnn "host 192.168.1.10" To include a filter append a quoted filter string in the command line. Tcpdump can be configured to only capture traffic according to specified filter. ![]() There are several tools and techniques used to simplify searching and extraction of useful data from captured data. ![]() Packet filtering is an important skill when capturing and managing large network dumps.
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