---
name: "tcpdrop"
section: "8"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["freebsd", "openbsd"]
url: "https://new.carta.tech/tcpdrop"
---

# tcpdrop(8)

drop a TCP connection

## NAME

**tcpdrop** – drop a TCP connection

## SYNOPSIS

**tcpdrop** *local-addr* *local-port* *remote-addr* *remote-port*

## DESCRIPTION

The **tcpdrop** command drops the TCP connection specified by the local address *local-addr*, port *local-port* and the foreign address *remote-addr*, port *remote-port*. Addresses and ports can be specified by name or numeric value.

To simplify dropping TCP connections using the output of [fstat(1)](/fstat/1.md) and [netstat(1)](/netstat/1.md), **tcpdrop** also supports a two-argument form where the address and port are separated by a colon (‘:’) or dot (‘.’) character.

## EXAMPLES

If a connection to [httpd(8)](/httpd/8.md) is causing congestion on a network link, one can drop the TCP session in charge:

```
$ fstat | grep 'httpd.*internet.*<--'
www      httpd      21307    3* internet stream tcp \
	0xd1007ca8 192.168.5.41:80 <-- 192.168.5.1:26747
```

Either of the following commands will drop the connection:

```
# tcpdrop 192.168.5.41 80 192.168.5.1 26747
# tcpdrop 192.168.5.41:80 192.168.5.1:26747
# tcpdrop 192.168.5.41.80 192.168.5.1.26747
```

## SEE ALSO

[fstat(1)](/fstat/1.md), [netstat(1)](/netstat/1.md)

## HISTORY

The **tcpdrop** program first appeared in OpenBSD 3.6.

## AUTHORS

The **tcpdrop** program was written by Markus Friedl ⟨*markus@openbsd.org*⟩.