#
# VyOS specific sysctl settings, see sysctl.conf (5) for information.
#

# Panic on OOPS
kernel.panic_on_oops=1

# Timeout before rebooting on panic
kernel.panic=60

# Send all core files to /var/core/core.program.pid.time
kernel.core_pattern=/var/core/core-%e-%p-%t

# ARP configuration
#  arp_filter - allow multiple network interfaces on same subnet
#  arp_announce - avoid local addresses no on target's subnet
#  arp_ignore - reply only if target IP is local_address on the interface

#  arp_filter defaults to 1 so set all to 0 so vrrp interfaces can override it.
net.ipv4.conf.all.arp_filter=0

# https://phabricator.vyos.net/T300
net.ipv4.conf.all.arp_ignore=0

net.ipv4.conf.all.arp_announce=2

# Enable packet forwarding for IPv4
net.ipv4.ip_forward=1

# if a primary address is removed from an interface promote the
# secondary address if available
net.ipv4.conf.all.promote_secondaries=1

# Ignore ICMP broadcasts sent to broadcast/multicast
net.ipv4.icmp_echo_ignore_broadcasts=1

# Ignore bogus ICMP errors
net.ipv4.icmp_ignore_bogus_error_responses=1

# Send ICMP responses with primary address of exiting interface
net.ipv4.icmp_errors_use_inbound_ifaddr=1

# Log packets with impossible addresses to kernel log
net.ipv4.conf.all.log_martians=1

# Do not ignore all ICMP ECHO requests by default
net.ipv4.icmp_echo_ignore_all=0

# Disable source validation by default
net.ipv4.conf.all.rp_filter=0
net.ipv4.conf.default.rp_filter=0

# Enable tcp syn-cookies by default
net.ipv4.tcp_syncookies=1

# Disable accept_redirects by default for any interface
net.ipv4.conf.all.accept_redirects=0
net.ipv4.conf.default.accept_redirects=0
net.ipv6.conf.all.accept_redirects=0
net.ipv6.conf.default.accept_redirects=0

# Disable accept_source_route by default
net.ipv4.conf.all.accept_source_route=0
net.ipv4.conf.default.accept_source_route=0
net.ipv6.conf.all.accept_source_route=0
net.ipv6.conf.default.accept_source_route=0

# Enable send_redirects by default
net.ipv4.conf.all.send_redirects=1

# Increase size of buffer for netlink
net.core.rmem_max=2097152

# Enable packet forwarding for IPv6
net.ipv6.conf.all.forwarding=1

# Increase route table limit
net.ipv6.route.max_size = 262144

# Do not forget IPv6 addresses when a link goes down
net.ipv6.conf.default.keep_addr_on_down=1
net.ipv6.conf.all.keep_addr_on_down=1

# Default value of 20 seems to interfere with larger OSPF and VRRP setups
net.ipv4.igmp_max_memberships = 512

# Enable conntrack helper by default
net.netfilter.nf_conntrack_helper=1

# Increase default garbage collection thresholds
net.ipv4.neigh.default.gc_thresh1 = 1024
net.ipv4.neigh.default.gc_thresh2 = 4096
net.ipv4.neigh.default.gc_thresh3 = 8192
#
net.ipv6.neigh.default.gc_thresh1 = 1024
net.ipv6.neigh.default.gc_thresh2 = 4096
net.ipv6.neigh.default.gc_thresh3 = 8192