# Enables IPv4/IPv6 Routing
net.ipv4.ip_forward = 1
net.ipv6.conf.all.forwarding=1
 
# Routing
net.ipv6.route.max_size=131072
net.ipv4.conf.all.ignore_routes_with_linkdown=1
net.ipv6.conf.all.ignore_routes_with_linkdown=1
 
 
# Best Settings for Peering w/ BGP Unnumbered
#    and OSPF Neighbors
net.ipv4.conf.all.rp_filter = 0
net.ipv4.conf.default.rp_filter = 0
net.ipv4.conf.lo.rp_filter = 0
net.ipv4.conf.all.forwarding = 1
net.ipv4.conf.default.forwarding = 1
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.default.arp_notify = 1
net.ipv4.conf.default.arp_ignore=1
net.ipv4.conf.all.arp_announce = 2
net.ipv4.conf.all.arp_notify = 1
net.ipv4.conf.all.arp_ignore=1
net.ipv4.icmp_errors_use_inbound_ifaddr=1
 
# Miscellaneous Settings
 
#   Keep ipv6 permanent addresses on an admin down
net.ipv6.conf.all.keep_addr_on_down=1
 
# igmp
net.ipv4.igmp_max_memberships=1000
net.ipv4.neigh.default.mcast_solicit = 10
 
# MLD
net.ipv6.mld_max_msf=512
 
# Garbage Collection Settings for ARP and Neighbors
net.ipv4.neigh.default.gc_thresh2=7168
net.ipv4.neigh.default.gc_thresh3=8192
net.ipv4.neigh.default.base_reachable_time_ms=14400000
net.ipv6.neigh.default.gc_thresh2=3584
net.ipv6.neigh.default.gc_thresh3=4096
net.ipv6.neigh.default.base_reachable_time_ms=14400000
 
# Use neigh information on selection of nexthop for multipath hops
net.ipv4.fib_multipath_use_neigh=1
 
# Allows Apps to Work with VRF
net.ipv4.tcp_l3mdev_accept=1