---
name: "atmloop"
section: "8"
platform: "linux"
package: "linux-atm"
version: "2.5.2-9"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/atmloop"
---

# atmloop(8)

get/set loopback mode of ATM interfaces

## NAME

atmloop - get/set loopback mode of ATM interfaces

## SYNOPSIS

**atmloop** **-s** \[**-l *level***\] \[**-r *level***\] \[***itf***\]\
 **atmloop** \[***itf***\]\
 **atmloop** **-q** \[***itf***\]\
 **atmloop** **-V**

## DESCRIPTION

**atmloop** sets or shows the current loopback settings of an ATM interface, and allows to query the loopback modes supported by the interface.

Some ATM cards can be configured to echo data back to the driver (local loopback) or to the network (remote loopback). The echoing may be done at several different levels:

- **aal**

  AAL PDUs

- **atm**

  ATM cells

- **digital**

  bits sent to or received from the line interface

- **analog**

  the analog signal

The levels supported by an interface can be queried with the **-q** option. If invoked without options, **atmloop** displays the current loopback settings.

## OPTIONS

- **-s**

  set loopback mode. Followed by either **-l** or **-r**, both options to set local and remote loopback at the same time (if supported by the driver), or none of them to turn off any loopback.

- **-l** *level*

  enable local loopback.

- **-r** *level*

  enable remote loopback.

- **-q** *level*

  query loopback levels supported by the interface.

- **-V**

  print version number of **atmloop** on standard output and exit.

## AUTHOR

Werner Almesberger, EPFL ICA \<Werner.Almesberger@epfl.ch\>

## SEE ALSO

[atmdiag(8)](/atmdiag/8.md), [sonetdiag(8)](/sonetdiag/8.md)