FW: Network tuning for Nagios with slave servers

[Wheeler, JF (Jonathan)]

-----Original Message-----
> From: Andreas Ericsson [mailto:ae at op5.se] 
> Sent: 07 September 2007 13:03

>> Wheeler, JF (Jonathan) wrote:
>> Our configuration is quite large (830 hosts, 160700+ services),

> You run more than 193 checks against each host? Good gods, you must
> be *really* curious about the state of those hosts :)

Oops, I meant 16700+ services !

> Nope, but you could try doing
>
>	sysconf net.ipv4.tcp_fin_timeout=30
>
> to halve the default tcp timeout in the kernel, which should reduce
> the number of half-open connections you have.

Thanks for the suggestion.  We are beginning to suspect a switch issue
as there are other applications that are suffering packet loss in
various ways.

Jonathan Wheeler
e-Science Centre
Rutherford Appleton Laboratory

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