This small program receives UDP datagrams on a given port, and resends those datagrams to a specified set of receivers. In addition, a sampling divisor N may be specified individually for each receiver, which will then only receive one in N of the received packets.
This distribution uses GNU configure for portability and flexibility of installation. You must configure the program for your system before you can compile it using make:
The program can then be installed (under /usr/local/bin by default) using "make install":
$ make install
The configure script accepts many arguments, some of which may even be useful. Using "./configure --prefix ..." you can specify a directory other than /usr/local to be used as an installation destination. Call "./configure --help" to get a list of arguments accepted by configure.
The usage convention for the program is
$ samplicate [<option>...] [<destination>...]
<option>can be one of
-d <level> to set the debugging level
-s <address> to set interface address on which to listen
for incoming packets (default any)
-p <port> to set the UDP port on which to listen for
incoming packets (default 2000)
-b <buflen> size of receive buffer (default 65536)
-c <configfile> specify a config file to read
-x <delay> to specify a transmission delay after each packet,
in units of microseconds
-S maintain (spoof) source addresses
-n don't compute UDP checksum (only relevant with -S)
-f fork program into background
-m <pidfile> write the process ID to a file
-4 IPv4 only
-6 IPv6 only
-h to print a usage message and exit
-u <pdulen> size of max pdu on listened socket (default 65536)
<destination>should be specified as
Config file format:
<addr> IP address of the receiver
<port> port UDP number of the receiver (default 2000)
<freq> number of received datagrams between successive
copied datagrams for this receiver.
<ttl> The TTL (IPv4) or hop-limit (IPv6) for
a.b.c.d[/e.f.g.h]: receiver ...
Receivers specified on the command line will get all packets, those specified in the config-file will get only packets with a matching source.
a.b.c.d is the sender's IP address
e.f.g.h is a mask to apply to the sender (default 255.255.255.255)
receiver see above.