---
name: "NetPacket::Ethernet"
section: "3pm"
platform: "linux"
package: "libnetpacket-perl"
version: "1.7.2-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/NetPacket::Ethernet"
---

# NetPacket::Ethernet(3pm)

Assemble and disassemble ethernet packets.

## NAME

NetPacket::Ethernet - Assemble and disassemble ethernet packets.

## VERSION

version 1.7.2

## SYNOPSIS

```
  use NetPacket::Ethernet;
  $eth_obj = NetPacket::Ethernet->decode($raw_pkt);
  $eth_pkt = NetPacket::Ethernet->encode(params...);   # Not implemented
  $eth_data = NetPacket::Ethernet::strip($raw_pkt);
```

## DESCRIPTION

`"NetPacket::Ethernet"` provides a set of routines for assembling and disassembling packets using the Ethernet protocol.

### Methods

- "NetPacket::Ethernet-\>decode(\[RAW PACKET\])"

  Decode the raw packet data given and return an object containing instance data.  This method will quite happily decode garbage input. It is the responsibility of the programmer to ensure valid packet data is passed to this method.

- "NetPacket::Ethernet-\>encode(param =\> value)"

  Return an ethernet packet encoded with the instance data specified. Not implemented.

### Functions

- "NetPacket::Ethernet::strip(\[RAW PACKET\])"

  Return the encapsulated data (or payload) contained in the ethernet packet.  This data is suitable to be used as input for other `"NetPacket::*"` modules.

  This function is equivalent to creating an object using the `"decode()"` constructor and returning the `"data"` field of that object.

### Instance data

The instance data for the `"NetPacket::Ethernet"` object consists of the following fields.

- src\_mac

  The source MAC address for the ethernet packet as a hex string.

- dest\_mac

  The destination MAC address for the ethernet packet as a hex string.

- type

  The protocol type for the ethernet packet.

- data

  The payload for the ethernet packet.

### Exports

- default

  none

- exportable

  ETH\_TYPE\_IP ETH\_TYPE\_ARP ETH\_TYPE\_APPLETALK ETH\_TYPE\_SNMP ETH\_TYPE\_IPv6 ETH\_TYPE\_PPP

- tags

  The following tags group together related exportable items.

  - ":types"

    ETH\_TYPE\_IP ETH\_TYPE\_ARP ETH\_TYPE\_APPLETALK ETH\_TYPE\_SNMP ETH\_TYPE\_IPv6 ETH\_TYPE\_PPP

  - ":strip"

    Import the strip function `"eth_strip"` which is an alias for `"NetPacket::Ethernet::strip"`

  - ":ALL"

    All the above exportable items.

## EXAMPLE

The following script dumps ethernet frames by mac address and protocol to standard output.

```
  #!/usr/bin/perl -w
  use strict;
  use Net::PcapUtils;
  use NetPacket::Ethernet;
  sub process_pkt {
      my($arg, $hdr, $pkt) = @_;
      my $eth_obj = NetPacket::Ethernet->decode($pkt);
      print("$eth_obj->{src_mac}:$eth_obj->{dest_mac} $eth_obj->{type}\n");
  }
  Net::PcapUtils::loop(\&process_pkt);
```

## TODO

- Implement "encode()" function

  ## COPYRIGHT

Copyright (c) 2001 Tim Potter and Stephanie Wehner.

Copyright (c) 1995,1996,1997,1998,1999 ANU and CSIRO on behalf of the participants in the CRC for Advanced Computational Systems ('ACSys').

This module is free software.  You can redistribute it and/or modify it under the terms of the Artistic License 2.0.

This program is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose.

## AUTHOR

Tim Potter \<tpot@samba.org\>