nacctd - network accounting daemon
nacctd [-dD] [-c
filename]
The network accounting daemon logs network traffic in a format
suitable for generating billing information or usage statistics.
nacctd listens on network interfaces and periodically writes
information to a log file.
nacctd is configured by editing its configuration file,
/etc/nacctd.conf.
- -d
- This will let nacctd run in debug mode
- -D
- This will make nacctd not to detach as a daemon, suitable for running it
from inittab.
- -c
- configfile Specify the path of an alternative config file.
- flush
<n>
- Flush every n seconds. This gives the interval in seconds when the
accumulated data is flushed to the output file. Typically set to 300 (five
minutes).
- fdelay
<n>
- This defines after how many seconds of inactivity a certain record of
traffic information may be written out. This helps making the log files
smaller since only one output record will be generated for related
traffic. Typically set to 60 seconds.
- file
<f>
- Specifies the main output file for the daemon to log network traffic
to.
- dumpfile
<f>
- Specifies a file to dump data to that is not yet written to the main
output file. This is to prevent data loss should a crash occur. On startup
an existing file of this name will be moved to <f>.o
- notdev
<interface>
- Don't log entries for this interface.
- device
<interface>
- Specifies a network interface to put into promiscuous mode.
- iflimit
<interface>
- Log only packets on this interface. Mutually exclusive with
hostlimit.
- ignoremask
<netmask>
- Specifies a netmask (in dotted quad format) for which traffic is ignored.
This allows traffic on the local LAN to be excluded.
- ignorenet
<network> <netmask>
- Ignore traffic on this network. Ignoring a net with ignorenet is not as
efficient as ignoremask. Thus you should exclude your local network with
ignoremask in preference to ignorenet.
- masqif
<ipaddr>
- Specifies an ip number we are masquerading as. This re-maps ip/port for
incoming connections (e.g. FTP-data) to ip/port of the masqueraded
destination.
- debug
<n>
- Sets the debugging level to <n>.
- Defines where the real data starts for each type of interface.
<interface-type> is one of eth, lo, plip, isdn etc.
<data-start> is the offset in bytes to the start of the real
data. <type-field> is the offset of the type field in bytes,
or a 0 if there is no type field. If SLIP or PPP devices are specified
here, association of dynamic ip addresses with usernames won't work (see
dynamicip below).
- dynamicip
<dir>
- Specifies a directory to get username information from, where users are
logged into ppp or slip accounts and assigned dynamic ip addresses. The
directory should contain a file for each logged in user, where the
filename is their IP address, and the file contains their username.
Typically, these files will be created by ip-up scripts.
- dynamicnet
<network> <netmask>
- Specifies the network the slip/ppp dynamic ips are assigned from.
- exclude-name-lookup
<network> <netmask>
- Specifies a (sub)net to exclude from dynamic ip name lookup.
- hostlimit
<ipaddr>
- Log only packets to/from this host. This may be specified multiple times
for multiple hosts. This option is mutually exclusive with
iflimit.
- disable
<n>
- Don't include field <n> in the output format.
- dontignore
<network> <netmask>
- Don't ignore hosts on the specified (sub)net that would otherwise have
been excluded by an ignorenet statement. This can be a useful to account
for proxy traffic by specifying the proxy servers' subnet.
- line <interface>
<device>
- Specifies fixed mapping of slip/ppp interface names to tty devices. This
is used to assign traffic to a user if nacctd runs on the ppp/slip server
and the relation between network interface and serial line is fixed. This
option is obsolete.
The output file consists of lines with up to 10 fields, or less if
the configuration file disables one or more fields.
timestamp protocol src-addr src-port dst-addr dst-port count
size user interface
- timestamp
- Time in seconds past the epoch (standard UNIX time format)
- protocol
- IP protocol
- count
- count of packets
- size
- size of data
- user
- associated user in case of a slip/ppp link, this will always be
"unknown" for other interfaces.
If the type is an ICMP message, field 4 is the ICMP message type
and field 6 is the ICMP message code.
Please note that for forwarded packets there will be one line for
EACH interface the packet passed. So if you are running this on your
slip-server you will get all the traffic over the slip interfaces TWICE,
once for the sl* devices and once for the eth* device. The same goes for ppp
and generally for all forwarded traffic. You can specify with 'notdev'
entries which interfaces you don't want to see in the log.
- /etc/nacctd.conf
- Configuration file
- /var/log/net-acct
- Default location for the main output file
- /var/log/net-acct-dump
- Default location for the dump of data not yet written to the main
file.
This manual page is incomplete, and possibly inaccurate.
Ulrich Callmeier
Richard Clark <rclark@ethos.co.nz>
This manual page was written by Alex King
<alex@king.net.nz>, for the Debian GNU/Linux system, using material
from the original documentation.