---
name: "moptrace"
section: "1"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["linux", "openbsd"]
url: "https://new.carta.tech/moptrace"
---

# moptrace(1)

MOP Trace Utility

## NAME

**moptrace** – MOP Trace Utility

## SYNOPSIS

**moptrace** \[**-3** \| **-4**\] \[**-ad**\] *interface*

## DESCRIPTION

**moptrace** prints the contents of MOP packages on the Ethernet connected to *interface* or all known interfaces if **-a** is given.

The options are as follows:

- **-3**

  Ignore MOP V3 messages (Ethernet II).

- **-4**

  Ignore MOP V4 messages (Ethernet 802.3).

- **-a**

  Listen on all the Ethernets attached to the system. If **-a** is omitted, an interface must be specified.

- **-d**

  Run in debug mode, with all the output to stderr.

## SEE ALSO

[mopa.out(1)](/mopa.out/1.md), [mopchk(1)](/mopchk/1.md), [mopprobe(1)](/mopprobe/1.md), [mopd(8)](/mopd/8.md) *DECnet Digital Network Architecture Phase IV*, Maintenance Operations Functional Specification V3.0.0, AA-X436A-TK. *DECnet Digital Network Architecture*, Maintenance Operations Protocol Functional Specification V4.0.0, EK-DNA11-FS-001.

## AUTHORS

Mats O Jansson ⟨*moj@stacken.kth.se*⟩