SHMIF_DUMPBUS(1) | General Commands Manual | SHMIF_DUMPBUS(1)

# NAME

`shmif_dumpbus` — examine shmif bus contents

# SYNOPSIS

`shmif_dumpbus` | [`-h`] [`-p` pcapfile] busfile

# DESCRIPTION

The `shmif_dumpbus` utility examines the bus of an shmif(4) Ethernet interface. The most useful feature is converting the bus to the pcap(3) file format for later examination. `shmif_dumpbus` itself is limited to displaying only very basic information about each frame.

`shmif_dumpbus` accepts the following flags:

`-h`
  Print bus header only and skip contents.
`-p` pcapfile
  Convert bus contents to the pcap(3) format and write the result to pcapfile. The file `-` signifies stdout.

# EXAMPLES

Feed the busfile contents to pcap:

    $ shmif_dumpbus -p - busfile | tcpdump -r -

# SEE ALSO

pcap(3), shmif(4), tcpdump(8)

# CAVEATS

`shmif_dumpbus` does not lock the busfile and is best used for post-mortem analysis of the bus traffic.

The timestamp for each frame contains the sender's timestamp and may not be monotonically increasing with respect to the frame order in the dump.

January 12, 2011 | NetBSD 11.0