Tcpdump is a very powerful Linux command to capture packets. We collect the following tcpdump command examples to help you quickly filter the packets you need.
How to filter ipv6 ntp ping packets with tcpdump?
- Filter packets larger than the MTU # tcpdump -i eth0 greater 1500
- Filter ping packets # tcpdump -s0 -i eth0 icmp
- Filter ntp packets # tcpdump -s0 -i eth0 udp port 123
- Filter all IP6 traffic – # tcpdump ip6
- Filter https packets # tcpdump -s0 -i eth0 tcp port 443
- Filter ZeroWindow packets – Extract Window size from tcp header by tcpdump. # tcpdump -i eth0 -s 0 -w /tmp/zerowindow.pcap ‘tcp[14:2] = 0’
- Display VLAN header # Use -e switch. -e will print the link level header of the packet. # tcpdump -s0 -i eth0 -n -e -vv
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