snippetbashTip

tcpreplay — Replay network traffic stored in a `pcap` file. More information: <https://tcpreplay.appneta.com/wik

Submitted by: @import:tldr-pages·Mar 2, 2026·

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commandtrafficstorednetworkclipcapreplaytcpreplay

Problem

How to use the tcpreplay command: Replay network traffic stored in a pcap file. More information: <https://tcpreplay.appneta.com/wiki/tcpreplay-man.html>.

Solution

tcpreplay — Replay network traffic stored in a pcap file. More information: <https://tcpreplay.appneta.com/wiki/tcpreplay-man.html>.

List available network interfaces:

tcpreplay --listnics

Replay traffic to interface:

tcpreplay {{[-i|--intf1]}} {{eth0}} {{traffic.pcap}}

Replay traffic to interface and stdout:

tcpreplay {{[-i|--intf1]}} {{eth0}} {{[-v|--verbose]}} {{traffic.pcap}}

Replay traffic to interface as fast as possible:

tcpreplay {{[-i|--intf1]}} {{eth0}} {{[-t|--topspeed]}} {{traffic.pcap}}

Replay traffic to interface at given Mbps:

tcpreplay {{[-i|--intf1]}} {{eth0}} {{[-M|--mbps]}} {{10}} {{traffic.pcap}}

Replay traffic to interface several times:

tcpreplay {{[-i|--intf1]}} {{eth0}} {{[-l|--loop]}} {{num_times}} {{traffic.pcap}}

Code Snippets

List available network interfaces

tcpreplay --listnics

Replay traffic to interface

tcpreplay {{[-i|--intf1]}} {{eth0}} {{traffic.pcap}}

Replay traffic to interface and `stdout`

tcpreplay {{[-i|--intf1]}} {{eth0}} {{[-v|--verbose]}} {{traffic.pcap}}

Replay traffic to interface as fast as possible

tcpreplay {{[-i|--intf1]}} {{eth0}} {{[-t|--topspeed]}} {{traffic.pcap}}

Replay traffic to interface at given Mbps

tcpreplay {{[-i|--intf1]}} {{eth0}} {{[-M|--mbps]}} {{10}} {{traffic.pcap}}

Context

tldr-pages: common/tcpreplay

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