host shows down but it is not

[Thomas Guyot-Sionnest]

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On 14/10/09 11:30 AM, Joe Konecny wrote:
> 
> Here is a tcpdump of plain Nagios pinging...
> 
> 11:23:50.328519 IP 10.0.0.4 > adsl-79.dacor.net: ICMP echo request, id 18478, seq 1, length 64
> 11:23:50.329365 IP adsl-79.dacor.net > 10.0.0.4: ICMP echo reply, id 18478, seq 1, length 64
> 11:23:51.328739 IP 10.0.0.4 > adsl-79.dacor.net: ICMP echo request, id 18478, seq 2, length 64
> 11:23:51.329368 IP adsl-79.dacor.net > 10.0.0.4: ICMP echo reply, id 18478, seq 2, length 64
> 11:23:52.327735 IP 10.0.0.4 > adsl-79.dacor.net: ICMP echo request, id 18478, seq 3, length 64
> 11:23:52.328472 IP adsl-79.dacor.net > 10.0.0.4: ICMP echo reply, id 18478, seq 3, length 64
> 11:23:53.326740 IP 10.0.0.4 > adsl-79.dacor.net: ICMP echo request, id 18478, seq 4, length 64
> 11:23:53.327578 IP adsl-79.dacor.net > 10.0.0.4: ICMP echo reply, id 18478, seq 4, length 64
> 11:23:54.327788 IP 10.0.0.4 > adsl-79.dacor.net: ICMP echo request, id 18478, seq 5, length 64
> 11:23:54.328478 IP adsl-79.dacor.net > 10.0.0.4: ICMP echo reply, id 18478, seq 5, length 64
> 
> Here is a tcpdump of check_mk pinging...
> 
> 11:29:24.042801 IP 10.0.0.4 > adsl-79.dacor.net: ICMP echo request, id 58673, seq 0, length 64
> 11:29:24.043603 IP adsl-79.dacor.net > 10.0.0.4: ICMP echo reply, id 58673, seq 0, length 64
> 11:29:24.043768 IP 10.0.0.4 > adsl-79.dacor.net: ICMP echo request, id 58673, seq 0, length 64
> 11:29:24.124046 IP 10.0.0.4 > adsl-79.dacor.net: ICMP echo request, id 58673, seq 0, length 64
> 11:29:24.204417 IP 10.0.0.4 > adsl-79.dacor.net: ICMP echo request, id 58673, seq 0, length 64
> 11:29:24.284728 IP 10.0.0.4 > adsl-79.dacor.net: ICMP echo request, id 58673, seq 0, length 64

The problem with check_mk pinging is that the ICMP sequence number
doesn't increase. Some devices treat this as a duplicate packed and
ignore it (I'm not sure what the RFC specify but this is probably the
correct behaviour).

Just use the non-mk host check command for the host definition with the
check_mk command for services and you should be fine.

- --
Thomas
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