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# you can disable an alarm notification by setting the 'to' line to: silent
# -----------------------------------------------------------------------------
alarm: ipv4_tcphandshake_last_collected_secs
on: ipv4.tcphandshake
os: linux freebsd
hosts: *
calc: $now - $last_collected_t
units: seconds ago
every: 10s
warn: $this > (($status >= $WARNING) ? ($update_every) : ( 5 * $update_every))
crit: $this > (($status == $CRITICAL) ? ($update_every) : (60 * $update_every))
delay: up 0 down 5m multiplier 1.5 max 1h
info: number of seconds since the last successful data collection
to: sysadmin
# -----------------------------------------------------------------------------
# tcp resets this host sends
alarm: 1m_ipv4_tcp_resets_sent
on: ipv4.tcphandshake
os: linux
hosts: *
lookup: average -1m at -10s unaligned absolute of OutRsts
units: tcp resets/s
every: 10s
info: average TCP RESETS this host is sending, over the last minute
alarm: 10s_ipv4_tcp_resets_sent
on: ipv4.tcphandshake
os: linux
hosts: *
lookup: average -10s unaligned absolute of OutRsts
units: tcp resets/s
every: 10s
warn: $this > ((($1m_ipv4_tcp_resets_sent < 5)?(5):($1m_ipv4_tcp_resets_sent)) * (($status >= $WARNING) ? (1) : (20)))
delay: up 20s down 60m multiplier 1.2 max 2h
options: no-clear-notification
info: average TCP RESETS this host is sending, over the last 10 seconds (this can be an indication that a port scan is made, or that a service running on this host has crashed; clear notification for this alarm will not be sent)
to: sysadmin
# -----------------------------------------------------------------------------
# tcp resets this host receives
alarm: 1m_ipv4_tcp_resets_received
on: ipv4.tcphandshake
os: linux freebsd
hosts: *
lookup: average -1m at -10s unaligned absolute of AttemptFails
units: tcp resets/s
every: 10s
info: average TCP RESETS this host is sending, over the last minute
alarm: 10s_ipv4_tcp_resets_received
on: ipv4.tcphandshake
os: linux freebsd
hosts: *
lookup: average -10s unaligned absolute of AttemptFails
units: tcp resets/s
every: 10s
warn: $this > ((($1m_ipv4_tcp_resets_received < 5)?(5):($1m_ipv4_tcp_resets_received)) * (($status >= $WARNING) ? (1) : (10)))
delay: up 20s down 60m multiplier 1.2 max 2h
options: no-clear-notification
info: average TCP RESETS this host is receiving, over the last 10 seconds (this can be an indication that a service this host needs, has crashed; clear notification for this alarm will not be sent)
to: sysadmin
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