---
name: "tcpkill"
section: "8"
platform: "linux"
package: "dsniff"
version: "2.4b1-34"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/tcpkill"
---

# tcpkill(8)

kill TCP connections on a LAN

## NAME

tcpkill - kill TCP connections on a LAN

## SYNOPSIS

```

```

**tcpkill** \[**-i** *interface*\] \[**-1**...**9**\] *expression*

## DESCRIPTION

**tcpkill** kills specified in-progress TCP connections (useful for libnids-based applications which require a full TCP 3-whs for TCB creation).

## OPTIONS

- **-i** *interface*

  Specify the interface to listen on.

- **-1**...**9**

  Specify the degree of brute force to use in killing a connection. Fast connections may require a higher number in order to land a RST in the moving receive window. Default is 3.

- *expression*

  Specify a [tcpdump(8)](/tcpdump/8.md) filter expression to select the connections to kill.

## SEE ALSO

[dsniff(8)](/dsniff/8.md), [tcpnice(8)](/tcpnice/8.md)

## AUTHOR

```
Dug Song <dugsong@monkey.org>
```