---
name: "flowreplay"
section: "1"
platform: "linux"
package: "tcpreplay"
version: "2.3.3-1"
release: "Debian 3.1 (Sarge)"
platforms: ["linux"]
url: "https://new.carta.tech/flowreplay"
---

# flowreplay(1)

replay TCP/UDP flows from a pcap capture file

## NAME

flowreplay - replay TCP/UDP flows from a pcap capture file

## SYNOPSIS

**flowreplay\[** **-h** \] **-i** *pcapfile* \[ **-m** *send \| wait \| bytes* \] \[ **-t targetip** \] \[ **-p** *proto/port* \] \[ **-V** \] \[ **-w** *sec.usec* \] \

## DESCRIPTION

*Flowreplay* is a tool for replaying client traffic to a server from files saved with *[tcpdump(8)](/tcpdump/8.md)*.

The basic operation of *flowreplay* is to connect to server(s) via the TCP/UDP protocols captured in the pcap file and replay the client side of the connection to the server.

## OPTIONS

- **-h**

  Help.

- **-i**

  Input file (pcap format)

- **-m**

  Mode to use to know when the server is done sending.  Options are 'send' as fast as you can, 'wait' for -w sec.usec, and send after recieving the previously captured number of 'bytes' from the server.

- **-t**

  The server to connect to in lieu of the IP addresses in the pcap file.

- **-p**

  The protocol and/or port to limit sending traffic on.  Valid protocols are: TCP and UDP; and any port between 0 and 65535.

- **-V**

  Print version info and exit.

- **-w**

  The number of seconds and micro-seconds represented as a float to wait  for the server to finish sending before sending more data.  Must be used with "-m wait".

- [tcpdump(8)](/tcpdump/8.md), [tcpreplay(8)](/tcpreplay/8.md), [capinfo(1)](/capinfo/1.md)

  ## SEE ALSO

## AUTHOR

Aaron Turner

The current version is packaged with tcpreplay which is available via HTTP:

*http://www.sourceforge.net/projects/tcpreplay/*

## BUGS

Probably a lot.  Some features not implimented yet.  Considered alpha quality code right now.

Please send bug reports to aturner@pobox.com.