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# -----------------------------------------------------------------------------
alarm: ipv4_tcphandshake_last_collected_secs
on: ipv4.tcphandshake
calc: $now - $last_collected_t
units: seconds ago
every: 10s
warn: $this > (($status >= $WARNING) ? (0) : ( 5 * $update_every))
crit: $this > (($status == $CRITICAL) ? (0) : (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
# -----------------------------------------------------------------------------
alarm: 1m_ipv4_tcp_resets
on: ipv4.tcphandshake
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
on: ipv4.tcphandshake
lookup: average -10s unaligned absolute of OutRsts
units: tcp resets/s
every: 10s
warn: $this > ((($1m_ipv4_tcp_resets < 5)?(5):($1m_ipv4_tcp_resets)) * (($status >= $WARNING) ? (1) : (4)))
delay: up 0 down 60m multiplier 1.2 max 2h
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)
to: sysadmin
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