---
name: "interfaces-forward"
section: "5"
platform: "linux"
package: "ifupdown-ng"
version: "0.12.1-7"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/interfaces-forward"
---

# interfaces-forward(5)

forwarding vocabulary for the interfaces(5) file format

## NAME

**interfaces-forward** - forwarding vocabulary for the [interfaces(5)](/interfaces/5.md) file format

## DESCRIPTION

Linux allows for configuration of IP packet forwarding behavior on a protocol and interface basis.  The following options allow for this configuration.

## FORWARDING-RELATED OPTIONS

The forward executor will only modify the sysctl configuration if these options are provided, otherwise other mechanisms such as /etc/sysctl.conf may be used.

**forward-ipv4** *yes\|no*

Whether the interface should forward unicast IPv4 packets.

**forward-ipv6** *yes\|no*

Whether the interface should forward unicast IPv6 packets.

**forward-ipv4-mc** *yes\|no*

Whether the interface should forward multicast IPv4 packets.

**forward-ipv6-mc** *yes\|no*

Whether the interface should forward multicast IPv6 packets.

## EXAMPLES

The typical home router scenario will want to forward both IPv4 and IPv6 packets:

```
iface WAN
	use dhcp
	forward-ipv4 yes
	forward-ipv6 yes
iface LAN
	address 192.168.0.1/24
	forward-ipv4 yes
	forward-ipv6 yes
```

## AUTHORS

Ariadne Conill \<ariadne@dereferenced.org\>