Firewall Wizards: Re: syslog and network management

[Timothy Shea <tim () tshea net>]

> we noticed a LOT of missing logs, when we changed to the default  
> debian
> syslogd we were able to handle an order of magnatude more logs  
> without any
> sign of missing logs (from around 100/sec to >1000/sec)
I am also perplexed by this.  syslog-ng has many (many) flaws but in  
terms of dropping packets it has always out-performed every syslogd  
implementation I have run across ("performance" as being defined as  
receiving the highest percentage of packets - this is UDP after  
all.)   So I have to question how it was implemented.  How did you  
validate the drop count?  How was syslog-ng implemented?  Which debian  
version?

t.s


On Feb 26, 2008, at 4:12 PM, david () lang hm wrote:

> On Mon, 25 Feb 2008, Brian Loe wrote:
>
> > On Fri, Feb 22, 2008 at 8:06 PM,  <david () lang hm> wrote:
> >
> > > > I've found that if you utilize, for instance, syslog-ng, you can  
> > > > split
> > > > up the log files based on whatever (device type, network, etc.).
> > > > Searching those smaller files is a lot less CPU intensive.
> > > true, but I found that syslog-ng was far less effective at the more
> > > important job of receiving syslog messages from the wire and  
> > > writing them
> > > to disk
> > Really? How so?
> >
> > We were logging 6 PIXen as well as many switches and routers (and a
> > much lesser level). We never "noticed" a great loss of messages... I
> > guess I can assume you did, and maybe I could learn from how you did!
> > :)
> >
> > What daemon do you use?
> we tried to use syslog-ng to receive activity from our border router  
> and
> write a copy locally (in large chunks) and relay the logs to another
> syslog server inside.
>
> we noticed a LOT of missing logs, when we changed to the default  
> debian
> syslogd we were able to handle an order of magnatude more logs  
> without any
> sign of missing logs (from around 100/sec to >1000/sec)
>
> David Lang
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