interfaces-forward - forwarding vocabulary for the interfaces(5) file format

Ariadne Conill <ariadne@dereferenced.org> 2025-03-25 interfaces-forward(5)

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

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

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-ipv4yes|no Whether the interface should forward unicast IPv4 packets. forward-ipv6yes|no Whether the interface should forward unicast IPv6 packets. forward-ipv4-mcyes|no Whether the interface should forward multicast IPv4 packets. forward-ipv6-mcyes|no Whether the interface should forward multicast IPv6 packets.

interfaces-forward - forwarding vocabulary for the interfaces(5) file format