P: /proc/sys/net/ipv4/conf/lo

[ .. ]

F: accept_local
F: accept_redirects
F: accept_source_route
F: arp_accept
F: arp_announce
F: arp_filter
F: arp_ignore
F: arp_notify
F: bc_forwarding
F: bootp_relay
F: disable_policy
F: disable_xfrm
F: drop_gratuitous_arp
F: drop_unicast_in_l2_multicast
F: force_igmp_version
F: forwarding
F: igmpv2_unsolicited_report_interval
F: igmpv3_unsolicited_report_interval
F: ignore_routes_with_linkdown
F: log_martians
F: mc_forwarding
F: medium_id
F: promote_secondaries
F: proxy_arp
F: proxy_arp_pvlan
F: route_localnet
F: rp_filter
F: secure_redirects
F: send_redirects
F: shared_media
F: src_valid_mark
F: tag