I've used Cacti and Nagios to good effect. (Cacti for traffic watching, 
Nagios for service monitoring)

Cacti: http://www.cacti.net/
Nagios: http://www.nagios.org/

sai wrote:

>http://www.netmeister.org/apps/snmpmon/index.html
>http://sourceforge.net/projects/snmpmon/
>
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>On 8/30/05, Rob MacGregor <rob dot macgregor at gmail dot com> wrote:
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>>On 29/08/05, D Syde <m0n0wall at evermore dot com> wrote:
>>    
>>
>>>Is there anything like WallWatcher (i.e. that will monitor m0n0wall)
>>>that will run under Linux?
>>>      
>>>
>>Depends on what you're after.  I've found Ganglia
>>(http://ganglia.sf.net) good and am about to start playing with Big
>>Brother (http://bb4.com).  They both serve different purposes (Ganglia
>>monitors pretty much everything about a system, BB is more about
>>service availability).
>>
>>-- 
>>                 Please keep list traffic on the list.
>>Rob MacGregor
>>      Whoever fights monsters should see to it that in the process he 
>>        doesn't become a monster.                  Friedrich Nietzsche
>>
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>>
>>    
>>
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