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Manual Reference Pages  -  OWAMPD.CONF (5)


owampd.conf - One-way latency daemon configuration file.


Configuration Options
See Also


The owampd.conf file is the configuration file for the owampd(8) daemon. It is used to configure the basic operation of the server. For example, what addresses and ports it should listen on, where it should send error messages, and where it should save files.

The policy rules for owampd are configured using the owampd.limits file; the details for configuring those policies are described in the owampd.limits(5) manual page.

The format of this file is:

o Comment lines are any line where the first non-whitespace character is ’#’. These lines are counted for the purposes of returning line numbers in error messages but are otherwise ignored by owampd.
o Lines may be continued using the semi-standard ’#146; character followed immediately by a newline character. This is the only valid place for the ’#146; character. If it is found elsewhere, a syntax error is reported.
o Blank lines are treated as comment lines.
o All other lines are used to set configuration options. The format of these lines is an initial keyword followed by a variable list of arguments, separated by whitespace.


authmode authmode
  Specify the authentication modes the server is willing to use for communication. authmode should be set as a character string, with any or all of the characters "AEO". The modes are:
A [A]uthenticated. This mode encrypts the control connection and encrypts part of each test packet.
E [E]ncrypted. This mode encrypts the control connection and encrypts each test packet in full. This mode forces an encryption step between the fetching of a timestamp and when the packet is sent. This adds more computational delay to the time reported by OWAMP for each packet.
O [O]pen. No encryption of any kind is done.
The server can specify all the modes with which it is willing to communicate. The most strict mode that both the server and the client are willing to use will be selected.
Default: "AEO".
controltimeout controltimeout
  Number of seconds to wait for protocol messages before timing out.
Default: 1800
datadir datadir
  Directory path where data files will be placed. The data files are the "receive" session files that are buffered on the server. Policy restrictions can be used to set how much disk space a given connection can use, as well as to determine when each file is deleted. (See the owampd.limits(f) manual page.)
Default: Current directory
dieby dieby
  Number of seconds to wait for child processes to gracefully terminate before killing them with SIGKILL. This is in response to the master process receiving SIGTERM or SIGHUP.

This option should no longer be needed. If child processes are not exiting gracefully, please send a bug report to owamp-users\
Default: 30

diskfudge diskfudge
  Fudge factor to use when determining if a buffered owp file should be kept. It creates a hard limit for disk usage. The soft limit is determined by the limitclass that a connection matches [see the owampd.limits(5) manual page] and is applied when a test is requested. If the estimated file-size of the test would put the limitclass over the soft limit, then the test is denied. However, it is possible, due to duplicate packets, that a test session file may end up larger than this estimate. If that happens, and if the file is successfully saved to disk, then, upon completion of the test, the actual file-size is used to update the disk usage in the resource broker process. At this point, the hard limit is applied. The hard limit is determined by multiplying the soft limit by the diskfudge. If the final file-size causes the disk space used by the limitclass to be larger than the quota defined by the hard limit then the file is immediately deleted.

A liberal factor is recommended because this factor won’t come in to play unless there are numerous duplicates, and that is precisely the kind of data most users will want to see. However, it is important to have this factor to ensure disk usage is not too vulnerable to replay DOS attacks of the test protocol.)

The valid values for diskfudge are 1.0-10.0.
Default: 1.0 (hard limit is the same as the soft limit)

enddelay enddelay
  Amount of time for a sender to wait after session completion (last packet send-time plus timeout) before sending the stop sessions message.

This is important if the sender clock is running ahead of the receiver clock.

A session is complete timeout after the send time of the final packet. If the sender clock is ahead of the receivers clock, the sender will declare the session complete before the receiver. The receiver is only allowed to retain records for the packets that were sent at least timeout before it receives the stop sessions message from the sender. Therefore, if the sender clock is running ahead of the receiver clock, the receiver will be forced to delete some number of the final packets from the session.

This parameter directs the sender to wait enddelay after session completion allowing the receiver clock to be essentially enddelay later than the sender clock and still retain full sessions.
Default: 1.0 (seconds)

facility facility
  Specify the syslog facility to log messages.
group group
  Specifies the gid the owampd process should run as. group can be specified using a valid group name on the system or by using -gid. This option is only used if owampd is started as root.

This option can be useful to limit log-file permissions to only users in this group.

  Directs the owampd process to report source code file and line number information with error messages. This is a particularly useful option to set when sending in messages as part of a bug report.
pbkdf2_count count
  This indicates the count parameter for the pseudo-random key derivation function that is used to derive the session key from the long term key stored in the owampd.pfs file.
Default: 2048
  If present, this disables the requirement that owampd run with non-root permissions. There are legitimate reasons to run owampd as root, but it is more risky. (For example, some operating systems require root permissions to set the TOS bits used by the -D and -H options of owping.) This additional option was added to ensure root permissions are only used when explicitly intended.
srcnode nodename:port
  Specify the address and port that owampd will listen for requests. nodename can be specified using a DNS name or using the textual representation of the address. It is possible to set the source address without setting the port by simply leaving off the ’:’ and port specification. Likewise, a non-default port can be specified for all system addresses (wildcard) by starting the specification string with a ’:’. If an IPv6 address is specified, note that the accepted format contains nodename in square brackets as: [fe80::fe9f:62d8]. This ensures the port number is distinct from the address specification. The address can be wildcarded by only specifying the port portion.

Because the default port for owampd is in the protected range for most operating systems, it is usually required that owampd is stared as root. This option can be used to specify a non-standard port value that is not protected.
Default: nodename is wildcarded as any currently available address
port is 861.

testports 0 | lowport-highport
  Specify the specific port range to use on the local host for OWAMP-Test packets. This can be specified in two ways. First, as 0 which would indicate owampd should allow the system to pick the port (ephemeral). Second, as a range. lowport must be a smaller value than highport and both numbers must be valid port values. (16 bit unsigned integer values)
Default: 0
user user
  Specifies the uid the owampd process should run as. user can be specified using a valid user name on the system or by using -uid. This option is only used if owampd is started as root.

In the default case, owampd should be started as root so it can bind the default port 861. (See srcnode option.) owampd will release root permissions shortly after binding to this protected port and requests will be serviced by processes running with permissions defined by the user.

vardir vardir
  Directory path where the and files will be placed.
Default: Current directory
  If this option is present, it directs the owampd process to generate more verbose messages to syslog.


owping(1), owampd(8), owampd.limits(5), owampd.pfs(5), pfstore(1), and the web site.


This material is based in part on work supported by the National Science Foundation (NSF) under Grant No. ANI-0314723. Any opinions, findings and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the NSF.
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--> OWAMPD.CONF (5) $Date: 2007-03-07 15:36:17 -0500 (Wed, 07 Mar 2007) $

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