Select SiLK Flow records form the data repository and partition the records into one or more 'pass' and/or 'fail' output streams.

Print the attributes of SiLK Flow records in a delimited, columnar, human-readable format. Users can define new printable attributes using plug-ins written in C or PySiLK.

Sort SiLK Flow records using a user-specified key comprised of record attributes, and write the records to the named output path or to the standard output. Users can define new key fields using plug-ins written in C or PySiLK.

Read, manipulate, and write SiLK Flow records, IPsets, and Bags from within Python. PySiLK may be used in a stand-alone Python program or to write plug-ins for several SiLK applications. This document describes the objects, methods, and functions that PySiLK provides. The next entry describes using PySiLK from within a plug-in.

Use PySiLK to define new partitioning rules for rwfilter, new key fields for rwcut, rwgroup, and rwsort, and new key or value fields for rwstats and rwuniq.

Summarize (aka group or bin) SiLK Flow records across time, producing textual output with counts of bytes, packets, and flow records for each time bin.

Summarize SiLK Flow records by a user-specified key comprised of record attributes and print columns for the total byte, packet, and/or flow counts for each bin. rwuniq can also count the number of distinct values for a field. Users can define new key fields and value fields using plug-ins written in C or PySiLK.

Summarize SiLK Flow records just like rwuniq, but sort the results by a value field to generate a Top-N or Bottom-N list, and print the results.

Summarize SiLK Flow records by a specified key and print the sum of the byte, packet, and flow counts for flows matching the key. rwtotal uses a fixed amount of memory, and it will faster that rwuniq, but it has a limited set of keys.

Summarize SiLK flow records by the source or destination IPv4 address and print the byte, packet, and flow counts for each IP.

Group SiLK flow records by a user-specified key comprised of record attributes, label the records with a group ID that is stored in the next-hop IP field, and write the resulting binary flows to the specified output path or to the standard output. rwgroup requires that its input is sorted by the user-specified key.

Match (mate) records as queries and responses, mark mated records with an ID that is stored in the next-hop IP field, and write the binary flow records to the output. rwmatch requires that its input files are sorted.

Read SiLK Flow records and generate binary IPset file(s) containing the source IP addresses or destination IP addresses seen on the flow records.

Read (textual) IP addresses in canonical form or in CIDR notation from an input file or from the standard input and write a binary IPset file.

Print the contents of a binary IPset file as text. Additional information about the IPset file can be printed.

Determine whether the IP address or CIDR block specified on the command line is contained in an IPset.

Perform union, intersection, difference, and sampling functions on the input IPset files, generating a new IPset file.

Read SiLK Flow records and build binary Bag(s) containing key-count pairs. An example is a Bag containing the sum of the byte counts for each source port seen on the flow records.

Create a binary Bag file from a binary IPset file or from a textual input file.

Print binary Bag files as text.

Perform operations (e.g., addition, subtraction) on binary Bag files and produce a new binary Bag file.

Read SiLK Flow records and build a binary Aggregate Bag containing key-count pairs. An example is a Aggregate Bag containing the sum of the byte counts for each source port seen on the flow records. Since SiLK 3.15.0.

Create a binary Aggregate Bag file from a textual input file. Since SiLK 3.15.0.

Prints binary Aggregate Bag files as text. Since SiLK 3.15.0.

Performs operations (e.g., addition, subtraction) on binary Aggregate Bag files and produces a new Aggregate Bag file. Since SiLK 3.15.0.

Read textual input and create a binary prefix map file for use with the Address Type (addrtype) and Prefix Map (pmapfilter) utilities.

Print information about a prefix map file as text. By default, print each IP range in the prefix map and its label.

Find information about specific IP address(es) or protocol/port pair(s) in a binary prefix map file and print the result as text.

Import a SiLK IPset, Bag, or Prefix Map file into the IP Address Association (IPA) data store.

Export a set of IP addresses from the IP Address Association (IPA) data store to a SiLK IPset, Bag, or Prefix Map.

The Address Type file provides a way to map an IPv4 address to an integer denoting the IP as internal, external, or non-routable.

The Country Code file provides a mapping from an IP address to a two-letter, lowercase abbreviation of the country where the IP address is located. The abbreviations used by the Country Code utility are those defined by ISO 3166-1.

Prefix Map files provide a way to map either IP addresses or protocol/port pairs to string labels based on a user-defined map file. The map file is created by rwpmapbuild.

The application-mismatch plug-in helps to find services running on unusual or non-typical ports by causing rwfilter to only pass a flow record when the record's application field is non-zero and its value is different than that in the source port and destination port fields.

The conficker-c plug-in was written in March 2009 to detect traffic that matches the signature of the .C variant of the Conficker worm.

The cutmatch plug-in creates a field in rwcut that provides a more user-friendly representation of the match parameter value that rwmatch writes into a SiLK Flow record's next hop IP field.

The Flowkey plug-in adds a switch and a field that computes a 32-bit hash for a flow record using the same algorithm as yaf uses for its flow key utility getFlowKeyHash. Since SiLK 3.15.0.

The Flowrate plug-in adds switches and fields to compute packets/second, bytes/second, bytes/packet, payload-bytes, and payload-bytes/second.

The internal/external plug-in makes available fields containing internal and external IPs and ports (int-ip, ext-ip, int-port, and ext-port). It can be used to print, sort by, or group by the internal or external IP or port, which is useful when a single flow file contains flows in multiple directions.

The IPA (IP Association) plug-in works with rwfilter to partition flows based on data in an IPA data store. rwfilter will automatically load this plug-in if it is available. The plug-in requires that SiLK be compiled with IPA support.

This page provides information on building your own SiLK plug-ins using C.

Convert a packet capture (pcap) file---such as a file produced by tcpdump---to a single file of SiLK Flow records. rwp2yaf2silk assumes that the yaf and rwipfix2silk commands are available on your system as it is a simple Perl wrapper around those commands.

Convert a stream of IPFIX (Internet Protocol Flow Information eXport) records to the SiLK Flow record format.

Convert a stream of SiLK Flow records to an IPFIX (Internet Protocol Flow Information eXport) format.

Read a packet capture file and print its contents in a textual form similar to that produced by rwcut.

Detect and eliminate duplicate records from multiple packet capture input files. See also rwdedupe.

Filter a packet capture file by writing only packets whose five-tuple and timestamp match corresponding records in a SiLK Flow file.

Read a packet capture file and generate a SiLK Flow record for every packet.

Create a stream of SiLK Flow records from a file containing NetFlow v5 PDU records.

Attempt to detect scanning activity from SiLK Flow records. rwscan can produce files that can be loaded into a database and queried with rwscanquery.

Query the scan database which has been populated from database load files generated by rwscan.

Append the SiLK Flow records contained in the second through final file name arguments to the records contained in the first file name argument.

Read SiLK Flow records from the files named on the command line, or from the standard input when no files are provided, and write the SiLK records to the specified output file or to the standard output if it is not connected to a terminal.

Read SiLK Flow records from files named on the command line or from the standard input. For records where the attributes field contains the "flow timed-out" flag, attempt to find the record with the corresponding "continuation" flag set and combine those records into a single flow. Write the results to the named output file or to the standard output. Since SiLK 3.9.0.

Determine whether two SiLK Flow files contain the same flow records.

Read SiLK Flow records from files named on the command line or from the standard input and write the records to the named output path or to the standard output, removing any duplicate flow records. Note that rwdedupe will reorder the records as part of its processing.

Read SiLK Flow records, zero the least significant bits of the source-, destination-, and/or next-hop-IP address(es), and write the resulting records to the named output path or to the standard output.

Generate a new SiLK Flow file by substituting a pseudo-random IP address for the source and destination IP addresses in given input file.

Read SiLK Flow records and generate a set of sub-files from the input. The sub-files can be limited by flow-, byte-, or packet-counts, or by unique IP count. In addition, the sub-file may contain all the flows or only a sample of them.

Generate a new SiLK Flow file by changing the byte order of the records in a given input SiLK Flow file.

Print information (type, version, etc.) about a SiLK Flow, IPset, Bag, or Prefix Map file.

Print information about the sensors, classes, and types specified in the silk.conf file.

Generate SiLK Flow records from textual input; the input should be in a form similar to what rwcut generates.

Print to the standard output the list of files that rwfilter would normally process for a given set of file selection switches.

Read delimited text from the standard input, convert integer values in the specified column(s) to dotted-decimal IP address, and print the result to the standard output.

Read delimited text from the standard input, attempt to resolve the IP addresses in the specified column(s) to host names, and print the result to the standard output.

Generate SiLK Flow records using a pseudo-random number generator; these records can be used to test SiLK applications.

Create the country code mapping file required by the ccfilter utility from the MaxMind GeoIP database.

Invoke rwfilter to find flow records matching Snort signatures.

Print information about how SiLK was compiled; this information can be used to compile and link other files and programs against the SiLK header files and libraries.

This command is deprecated; use rwsiteinfo instead. Map between sensor names and sensor IDs using the values specified in the silk.conf file.

This command is deprecated; use a combination of rwpdu2silk, rwstats, and rwuniq instead. Read a file containing NetFlow v5 PDU records and print the SNMP interfaces that are used most often and the number of records seen for each interface.

This command is deprecated; use rwpmaplookup instead. Map a (textual) list of IP addresses to their country code.