|IPGRAB(8)||System Manager's Manual||IPGRAB(8)|
ipgrab - A Verbose Packet Sniffer
ipgrab [ -ablmnPprTtwx ] [ -c cnt ] [ -i if ] [ expr ]
ipgrab reads and parses packets from the link layer through the application layer, dumping explicit header information along the way. It is a lot like tcpdump except that it prints almost every header field.
- Do not display application layer data.
- Buffer standard output. Useful when you're redirecting output to a file.
- -c cnt, --count cnt
- Terminate after receiving cnt packets.
- -C proto, --CCP proto
- Assume a particular CCP protocol, such as MPPC. MPPC is the only one supported as yet.
- Dump extra padding in packets. For example, according to an IP header, the packet ends at a certain point, but the link layer may have padded it beyond that. This option displays the padding. Not valid in minimal mode.
- -h, --help
- Display usage screen with a brief description of the command line options.
- -i if, --interface if
- Makes ipgrab listen to packets on interface if, e.g., eth0. If this option is not used, the default interface will be assumed.
- Don't display link-layer headers. The following protocols are considered to be link layer: ARP, CHAP, Ethernet, IPCP, LCP, LLC, Loopback, PPP, PPPoE, Raw, Slip.
- Minimal mode output. When operating in this mode, ipgrab displays only brief header information.
- Don't display network-layer headers. The following protocols are considered to be network layer: AH, ESP, GRE, ICMP, ICMPv6, IGMP, IP, IPv6, IPX, IPXRIP.
- -P string
- Initiate a dynamic port mapping. This option must be followed by a string of the form `<protocol>=<port>', such as `http=8080'.
- Dump packet payloads beyond what IPgrab parses. In other words, if IPgrab does not parse a particular application, this option will dump application data in hex and text format.
- -r FILE
- Read packets from a file, rather than an interface. The file should be created in "raw" format, such as with '-w' option.
- Do not display timestamps in minimal mode.
- Don't display transport layer headers. The following protocols are considered to be transport layer: SPX, TCP, UDP.
- -v, --version
- Display version number and then quit.
- -w FILE
- Write the raw packets to a file, rather than the screen. The packets will not be parsed. The file can be read with the '-r' option.
- Hex dump mode. After processing each layer, dump out the contents of that layer in hex and text. Only valid in main mode.
- Berkeley packet filter expression. See tcpdump(8) man page for details and examples.
Requires libpcap version 0.3 or greater to be installed.
Michael S. Borella
|07 March 2007|