---
name: "Net::Write::Layer4"
section: "3pm"
platform: "linux"
package: "libnet-write-perl"
version: "1.10-3"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Net::Write::Layer4"
---

# Net::Write::Layer4(3pm)

object for a transport layer (layer 4) descriptor

## NAME

Net::Write::Layer4 - object for a transport layer (layer 4) descriptor

## SYNOPSIS

```
   use Net::Write::Layer qw(:constants);
   use Net::Write::Layer4;
   my $desc = Net::Write::Layer4->new(
      dst      => '192.168.0.1',
      protocol => NW_IPPROTO_TCP,
      family   => NW_AF_INET,
   );
   $desc->open;
   $desc->send('G'x666);
   $desc->close;
```

## DESCRIPTION

This is the class for creating a layer 4 descriptor.

## ATTRIBUTES

- **dst**

  The target IPv4 or IPv6 address we will send frames to.

- **family**

  Address family, see **Net::Write::Layer** CONSTANTS section.

- **protocol**

  Transport layer protocol to use, see **Net::Write::Layer** CONSTANTS section.

## METHODS

- **new**

  Object constructor. You MUST pass a valid **dst** attribute. Default values:

  protocol: NW\_IPPROTO\_TCP

  family:   NW\_AF\_INET

  Returns undef on error.

- **open**

  Open the interface. Returns undef on error.

- **send** (scalar)

  Send raw data to the network.

- **close**

  Close the descriptor.

## CAVEATS

Does not work at all under Win32 systems. They can't send frames at layer 4.

## SEE ALSO

Net::Write::Layer

## AUTHOR

Patrice \<GomoR\> Auffret

## COPYRIGHT AND LICENSE

Copyright (c) 2006-2015, Patrice \<GomoR\> Auffret

You may distribute this module under the terms of the Artistic license. See LICENSE.Artistic file in the source distribution archive.