The pppstats utility reports PPP-related statistics at regular
intervals for the specified PPP interface. If the interface is
unspecified, it will default to ppp0. The display is split
horizontally into input and output sections containing columns of
statistics describing the properties and volume of packets
received and transmitted by the interface.
The options are as follows:
-a Display absolute values rather than deltas. With this
option, all reports show statistics for the time since the
link was initiated. Without this option, the second and
subsequent reports show statistics for the time since the
last report.
-d Show data rate (kB/s) instead of bytes.
-c count
Repeat the display count times. If this option is not
specified, the default repeat count is 1 if the -w option
is not specified, otherwise infinity.
-r Display additional statistics summarizing the compression
ratio achieved by the packet compression algorithm in use.
-v Display additional statistics relating to the performance
of the Van Jacobson TCP header compression algorithm.
-w wait
Pause wait seconds between each display. If this option
is not specified, the default interval is 5 seconds.
-z Instead of the standard display, show statistics
indicating the performance of the packet compression
algorithm in use.
The following fields are printed on the input side when the -z
option is not used:
IN The total number of bytes received by this interface.
PACK The total number of packets received by this interface.
VJCOMP The number of header-compressed TCP packets received by
this interface.
VJUNC The number of header-uncompressed TCP packets received by
this interface. Not reported when the -r option is
specified.
VJERR The number of corrupted or bogus header-compressed TCP
packets received by this interface. Not reported when the
-r option is specified.
VJTOSS The number of VJ header-compressed TCP packets dropped on
reception by this interface because of preceding errors.
Only reported when the -v option is specified.
NON-VJ The total number of non-TCP packets received by this
interface. Only reported when the -v option is specified.
RATIO The compression ratio achieved for received packets by the
packet compression scheme in use, defined as the
uncompressed size divided by the compressed size. Only
reported when the -r option is specified.
UBYTE The total number of bytes received, after decompression of
compressed packets. Only reported when the -r option is
specified.
The following fields are printed on the output side:
OUT The total number of bytes transmitted from this interface.
PACK The total number of packets transmitted from this
interface.
VJCOMP The number of TCP packets transmitted from this interface
with VJ-compressed TCP headers.
VJUNC The number of TCP packets transmitted from this interface
with VJ-uncompressed TCP headers. Not reported when the
-r option is specified.
NON-VJ The total number of non-TCP packets transmitted from this
interface. Not reported when the -r option is specified.
VJSRCH The number of searches for the cached header entry for a
VJ header compressed TCP packet. Only reported when the
-v option is specified.
VJMISS The number of failed searches for the cached header entry
for a VJ header compressed TCP packet. Only reported when
the -v option is specified.
RATIO The compression ratio achieved for transmitted packets by
the packet compression scheme in use, defined as the size
before compression divided by the compressed size. Only
reported when the -r option is specified.
UBYTE The total number of bytes to be transmitted, before packet
compression is applied. Only reported when the -r option
is specified.
When the -z option is specified, pppstats instead displays the
following fields, relating to the packet compression algorithm
currently in use. If packet compression is not in use, these
fields will all display zeroes. The fields displayed on the
input side are:
COMPRESSED BYTE
The number of bytes of compressed packets received.
COMPRESSED PACK
The number of compressed packets received.
INCOMPRESSIBLE BYTE
The number of bytes of incompressible packets (that is,
those which were transmitted in uncompressed form)
received.
INCOMPRESSIBLE PACK
The number of incompressible packets received.
COMP RATIO
The recent compression ratio for incoming packets, defined
as the uncompressed size divided by the compressed size
(including both compressible and incompressible packets).
The fields displayed on the output side are:
COMPRESSED BYTE
The number of bytes of compressed packets transmitted.
COMPRESSED PACK
The number of compressed packets transmitted.
INCOMPRESSIBLE BYTE
The number of bytes of incompressible packets transmitted
(that is, those which were transmitted in uncompressed
form).
INCOMPRESSIBLE PACK
The number of incompressible packets transmitted.
COMP RATIO
The recent compression ratio for outgoing packets.
