Netconf on Linux:
root@hub:~# ip netconf
ipv4 dev lo forwarding off rp_filter off mc_forwarding off proxy_neigh off ignore_routes_with_linkdown off
ipv4 dev eth0 forwarding off rp_filter off mc_forwarding off proxy_neigh off ignore_routes_with_linkdown off
ipv4 dev eth1 forwarding off rp_filter off mc_forwarding off proxy_neigh off ignore_routes_with_linkdown off
ipv4 dev eth2 forwarding off rp_filter off mc_forwarding off proxy_neigh off ignore_routes_with_linkdown off
ipv4 all forwarding off rp_filter off mc_forwarding off proxy_neigh off ignore_routes_with_linkdown off
ipv4 default forwarding off rp_filter off mc_forwarding off proxy_neigh off ignore_routes_with_linkdown off
...