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options: Add documentation for filter-dump 

Add a short description for the filter-dump command line options.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
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Thomas Huth 2015-10-13 12:40:02 +02:00 committed by Jason Wang
parent 9d3e12e881
commit d3e0c032f5
1 changed files with 8 additions and 0 deletions
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qemu-options.hx
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@ -2012,6 +2012,7 @@ qemu -m 512 -object memory-backend-file,id=mem,size=512M,mem-path=/hugetlbfs,sha
Dump network traffic on VLAN @var{n} to file @var{file} (@file{qemu-vlan0.pcap} by default).
At most @var{len} bytes (64k by default) per packet are stored. The file format is
libpcap, so it can be analyzed with tools such as tcpdump or Wireshark.
Note: For devices created with '-netdev', use '-object filter-dump,...' instead.
@item -net none
Indicate that no network devices should be configured. It is used to
@ -3665,6 +3666,13 @@ queue @var{all|rx|tx} is an option that can be applied to any netfilter.
@option{tx}: the filter is attached to the transmit queue of the netdev,
where it will receive packets sent by the netdev.
@item -object filter-dump,id=@var{id},netdev=@var{dev},file=@var{filename}][,maxlen=@var{len}]
Dump the network traffic on netdev @var{dev} to the file specified by
@var{filename}. At most @var{len} bytes (64k by default) per packet are stored.
The file format is libpcap, so it can be analyzed with tools such as tcpdump
or Wireshark.
@end table
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