...

/usr/share/cagefs-skeleton/proc/sys/net/ipv4/conf/all

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