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# you can disable an alarm notification by setting the 'to' line to: silent
# -----------------------------------------------------------------------------
# dropped packets
# check if an interface is dropping packets
# the alarm is checked every 1 minute
# and examines the last 10 minutes of data
template: inbound_packets_dropped
on: net.drops
os: linux
hosts: *
families: *
lookup: sum -10m unaligned absolute of inbound
units: packets
every: 1m
warn: $this >= 5
delay: down 1h multiplier 1.5 max 2h
info: interface inbound dropped packets in the last 10 minutes
to: sysadmin
template: outbound_packets_dropped
on: net.drops
os: linux
hosts: *
families: *
lookup: sum -10m unaligned absolute of outbound
units: packets
every: 1m
warn: $this >= 5
delay: down 1h multiplier 1.5 max 2h
info: interface outbound dropped packets in the last 10 minutes
to: sysadmin
template: inbound_packets_dropped_ratio
on: net.packets
os: linux
hosts: *
families: *
lookup: sum -10m unaligned absolute of received
calc: (($inbound_packets_dropped != nan AND $this > 0) ? ($inbound_packets_dropped * 100 / $this) : (0))
units: %
every: 1m
warn: $this >= 0.1
crit: $this >= 2
delay: down 1h multiplier 1.5 max 2h
info: the ratio of inbound dropped packets vs the total number of received packets of the network interface, during the last 10 minutes
to: sysadmin
template: outbound_packets_dropped_ratio
on: net.packets
os: linux
hosts: *
families: *
lookup: sum -10m unaligned absolute of sent
calc: (($outbound_packets_dropped != nan AND $this > 0) ? ($outbound_packets_dropped * 100 / $this) : (0))
units: %
every: 1m
warn: $this >= 0.1
crit: $this >= 2
delay: down 1h multiplier 1.5 max 2h
info: the ratio of outbound dropped packets vs the total number of sent packets of the network interface, during the last 10 minutes
to: sysadmin
# -----------------------------------------------------------------------------
# FIFO errors
# check if an interface is having FIFO
# buffer errors
# the alarm is checked every 1 minute
# and examines the last 10 minutes of data
template: 10min_fifo_errors
on: net.fifo
os: linux
hosts: *
families: *
lookup: sum -10m unaligned absolute
units: errors
every: 1m
warn: $this > 0
delay: down 1h multiplier 1.5 max 2h
info: interface fifo errors in the last 10 minutes
to: sysadmin
# -----------------------------------------------------------------------------
# check for packet storms
# 1. calculate the rate packets are received in 1m: 1m_received_packets_rate
# 2. do the same for the last 10s
# 3. raise an alarm if the later is 10x or 20x the first
# we assume the minimum packet storm should at least have
# 10000 packets/s, average of the last 10 seconds
template: 1m_received_packets_rate
on: net.packets
os: linux freebsd
hosts: *
families: *
lookup: average -1m of received
units: packets
every: 10s
info: the average number of packets received during the last minute
template: 10s_received_packets_storm
on: net.packets
os: linux freebsd
hosts: *
families: *
lookup: average -10s of received
calc: $this * 100 / (($1m_received_packets_rate < 1000)?(1000):($1m_received_packets_rate))
every: 10s
units: %
warn: $this > (($status >= $WARNING)?(200):(5000))
crit: $this > (($status >= $WARNING)?(5000):(6000))
options: no-clear-notification
info: the % of the rate of received packets in the last 10 seconds, compared to the rate of the last minute (clear notification for this alarm will not be sent)
to: sysadmin
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