---
name: "dnsjit.core.object.gre"
section: "3"
platform: "linux"
package: "dnsjit"
version: "1.5.0-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/dnsjit.core.object.gre"
---

# dnsjit.core.object.gre(3)

Generic Routing Encapsulation (GRE) part of a packet

## NAME

dnsjit.core.object.gre - Generic Routing Encapsulation (GRE) part of a packet

## DESCRIPTION

The GRE part of a packet that usually can be found in the object chain after parsing with, for example, Layer filter. See RFC 1701.

### Attributes

- gre\_flags

  The GRE flags.

- ether\_type

  The protocol type of the payload packet.

- checksum

  The checksum of the GRE header and the payload packet.

- key

  The Key field contains a four octet number which was inserted by the encapsulator.

- sequence

  The Sequence Number field contains an unsigned 32 bit integer which is inserted by the encapsulator.

### Functions

- **Gre:type**()

  Return the textual type of the object.

- **Gre:prev**()

  Return the previous object.

- **Gre:cast**()

  Cast the object to the underlining object module and return it.

- **Gre:uncast**()

  Cast the object to the generic object module and return it.

- **Gre:copy**()

  Make a copy of the object and return it.

- **Gre:free**()

  Free the object, should only be used on copies or otherwise allocated.

## SEE ALSO

[**dnsjit.core.object**(3)](/dnsjit.core.object/3.md), [**dnsjit.filter.layer**(3)](/dnsjit.filter.layer/3.md)

## AUTHORS and CONTRIBUTORS

Jerry Lundström (DNS-OARC), Tomáš Křížek (CZ.NIC), Petr Špaček (ISC)

Maintained by DNS-OARC

*https://www.dns-oarc.net/*

## BUGS

For issues and feature requests please use:

*https://github.com/DNS-OARC/dnsjit/issues*

For question and help please use:

*admin@dns-oarc.net*