PPPSTATS(8) System Manager's Manual PPPSTATS(8)
NAME
pppstats - print PPP statistics
SYNOPSIS
pppstats [ -a ] [ -v ] [ -r ] [ -z ] [ -c <count> ] [ -w <secs> ] [ interface ]
DESCRIPTION
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 out‐
put 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.
-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 pre‐
ceding 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
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, 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 com‐
pressed 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
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