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

# tcpnice(8)

slow down TCP connections on a LAN

## NAME

tcpnice - slow down TCP connections on a LAN

## SYNOPSIS

```

```

**tcpnice** \[**-A**\] \[**-I**\] \[**-M**\] \[**-i** *interface*\] *expression*

## DESCRIPTION

**tcpnice** slows down specified TCP connections on a LAN via "active" traffic shaping.

## OPTIONS

- **-A**

  Inject TCP tiny window advertisements.

- **-I**

  Inject ICMP source quench replies.

- **-M**

  Inject ICMP fragmentation-needed replies with tiny next-hop MTUs.

- **-i** *interface*

  Specify the interface to listen on.

- *expression*

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

If no attack type is given, all attacks will be enabled.

## SEE ALSO

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

## AUTHOR

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