Definition of Done: Please mark each item below with ( / ) if completed or ( x ) if incomplete: ( ) The acceptance criteria defined below are met. Given a system administrator has configured a NetworkManager connection profile for an Ethernet interface (e.g., eth1), When the system administrator sets ipv4.forwarding to yes in the NetworkManager profile for that interface, Then NetworkManager should apply the sysctl setting net.ipv4.conf.eth1.forward=1, enabling IP forwarding for that interface Given a system administrator has configured a NetworkManager connection profile for an Ethernet interface (e.g., eth1), When the system administrator sets ipv4.forwarding to no in the NetworkManager profile for that interface, Then NetworkManager should apply the sysctl setting net.ipv4.conf.eth1.forward=0, disabling IP forwarding for that interface   Given a system administrator has configured a NetworkManager connection profile for an Ethernet interface (e.g., eth1), When the system administrator sets ipv4.forwarding to auto in the NetworkManager profile for that interface, Then NetworkManager should set the forwarding only if there is an activated shared connection.    Given a system administrator has configured a NetworkManager connection profile for an Ethernet interface (e.g., eth1), When the system administrator sets ipv4.forwarding to ignore in the NetworkManager profile for that interface, Then NetworkManager should not modify the current forwarding configuration for that interface. ( ) Code changes are included in a downstream build attached to an errata. ( ) All required testing (manual and/or automated) passes successfully. ( ) Related documentation updates (if applicable) have been completed.

.NetworkManager and Nmstate support configuring IPv4 forwarding per interface With this enhancement, NetworkManager can enable and disable IPv4 forwarding per network interface. This enables granular control directly in NetworkManager connection profiles, and updating `sysctl` kernel settings is no longer required. If you enable the `ipv4.forwarding` parameter in a profile, the corresponding interface acts as a router and forwards IPv4 packets. With the default value `auto`, NetworkManager enables IPv4 forwarding if any shared connection is active and, in other cases, it uses the kernel default value. This feature is also available in Nmstate.