NFREPLAY(1) General Commands Manual NFREPLAY(1)

nfreplay — replay binary flow files as netflow version v5 or v9 to a remote host

nfreplay -r flowfile -H remotehost -p port [-S Sourceaddr] [-j mcastgroup] [-4] [-6] [-v version] [-d usec] [-b buffsize] [-z num] [-c num] [-v] [-H] [filter]

nfreplay reads binary flow files stored by any nfdump collector and sents the flow records to a remote host or a multicast group.

nfreplay sends the data as netflow v5 or v9 to the remote location.

nfreplay accepts a filter to limit the flows to be sent. The filter syntax is equivalent to nfdump.

The options are as follows:

flowfile
Read input data from flowfile.
remotehost
Send all flows to this remote host. Accepts a symbolic name or a IPv4/IPv6 IP address.
mcastgroup
Join this multicast group and send all flows to this group host. Accepts a symbolic name or multicast IPv4/IPv6 IP address.
port
Send all flows to this port on the remote side. Default is 9995.
Sourceaddr
Use the specified source IP address to send the flows
Forces nfreplay to send flows to a IPv4 address only. Can be used if the remote host has an IPv4 and IPv6 address record.
Forces nfreplay to send flows to a IPv6 address only. Can be used if the remote host has an IPv4 and IPv6 address record.
version
Send flows as netflow version version. Version V5 and v9 are supported. In v5 mode, all additional elements to a stadard v5 record are skipped and 64bit counters are truncated to 32bit. The default is v9.
usec
Delay each record by usec mirco seconds, to avoid overrun on the remote host. Default is 10usec.
buffsize
Set send buffer to buffsize size in bytes. Useful to buffer larger data transfers.
num
Flows are sent with their "real distribution" acrross time (with a speed coefficient)
  • 1 : 5 minutes of records will be sent in 5 minutes. - z 20 : 5 minutes of record will be sent in 5/20 = 0.25 minutes.
num
Limit number of records to send to the first num flows.
Print nfreplay version and exit.
Print help text on stdout with all options and exit.

nfreplay returns

nfdump(1) nfcapd(1)

January 31, 2025 Debian