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64 lines
2.1 KiB
Text
64 lines
2.1 KiB
Text
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# TCPDump is a packet analyzer. It allows the user to intercept and display TCP/IP
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# and other packets being transmitted or received over a network. (cf Wikipedia).
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# Note: 173.194.40.120 => google.com
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# Intercepts all packets on eth0
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tcpdump -i eth0
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# Intercepts all packets from/to 173.194.40.120
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tcpdump host 173.194.40.120
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# Intercepts all packets on all interfaces from / to 173.194.40.120 port 80
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# -nn => Disables name resolution for IP addresses and port numbers.
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tcpdump -nn -i any host 173.194.40.120 and port 80
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# Make a grep on tcpdump (ASCII)
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# -A => Show only ASCII in packets.
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# -s0 => By default, tcpdump only captures 68 bytes.
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tcpdump -i -A any host 173.194.40.120 and port 80 | grep 'User-Agent'
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# With ngrep
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# -d eth0 => To force eth0 (else ngrep work on all interfaces)
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# -s0 => force ngrep to look at the entire packet. (Default snaplen: 65536 bytes)
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ngrep 'User-Agent' host 173.194.40.120 and port 80
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# Intercepts all packets on all interfaces from / to 8.8.8.8 or 173.194.40.127 on port 80
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tcpdump 'host ( 8.8.8.8 or 173.194.40.127 ) and port 80' -i any
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# Intercepts all packets SYN and FIN of each TCP session.
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tcpdump 'tcp[tcpflags] & (tcp-syn|tcp-fin) != 0'
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# To display SYN and FIN packets of each TCP session to a host that is not on our network
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tcpdump 'tcp[tcpflags] & (tcp-syn|tcp-fin) != 0 and not src and dst net local_addr'
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# To display all IPv4 HTTP packets that come or arrive on port 80 and that contain only data (no SYN, FIN no, no packet containing an ACK)
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tcpdump 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)'
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# Saving captured data
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tcpdump -w file.cap
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# Reading from capture file
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tcpdump -r file.cap
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# Show content in hexa
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# Change -x to -xx => show extra header (ethernet).
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tcpdump -x
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# Show content in hexa and ASCII
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# Change -X to -XX => show extra header (ethernet).
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tcpdump -X
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# Note on packet maching:
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# Port matching:
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# - portrange 22-23
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# - not port 22
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# - port ssh
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# - dst port 22
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# - src port 22
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#
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# Host matching:
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# - dst host 8.8.8.8
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# - not dst host 8.8.8.8
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# - src net 67.207.148.0 mask 255.255.255.0
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# - src net 67.207.148.0/24
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