You may also use Wireshark capture and analysis tool. To capture all packets from a specific host on the network: To assist with this process, the tcpdump utility allows the creation of filter expressions based on the following protocol types: ether fddi ip arp rarp tcp udp icmp TCP flag headers are located in the 14th byte of the header. Tcpdump: verbose output suppressed, use -v or -vv for full protocol decode To capture all packets on the WAN (the below assumes that interface eth1 is the WAN interface): tcpdump relies on libcap, therefore it can produce standard pcap analysis files which may be processed by other tools. virgo: sudo tcpdump -vvvv -ttt -i eth1 icmp6 and 'ip6 40 134'. It may be used to capture packets on the fly and/or save them in a file for later analysis. Capture of IPv6 advertisement message via tcpdump. Tcpdump is a network capture and analysis tool.
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